diff --git a/clang/include/clang/Driver/ToolChain.h b/clang/include/clang/Driver/ToolChain.h
--- a/clang/include/clang/Driver/ToolChain.h
+++ b/clang/include/clang/Driver/ToolChain.h
@@ -412,7 +412,7 @@
 
   /// IsIntegratedAssemblerDefault - Does this tool chain enable -integrated-as
   /// by default.
-  virtual bool IsIntegratedAssemblerDefault() const { return false; }
+  virtual bool IsIntegratedAssemblerDefault() const { return true; }
 
   /// IsIntegratedBackendDefault - Does this tool chain enable
   /// -fintegrated-objemitter by default.
diff --git a/clang/lib/Driver/ToolChains/AIX.h b/clang/lib/Driver/ToolChains/AIX.h
--- a/clang/lib/Driver/ToolChains/AIX.h
+++ b/clang/lib/Driver/ToolChains/AIX.h
@@ -68,7 +68,6 @@
   }
   bool isPICDefaultForced() const override { return true; }
   bool HasNativeLLVMSupport() const override { return true; }
-  bool IsIntegratedAssemblerDefault() const override { return true; }
 
   void
   AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
diff --git a/clang/lib/Driver/ToolChains/CrossWindows.h b/clang/lib/Driver/ToolChains/CrossWindows.h
--- a/clang/lib/Driver/ToolChains/CrossWindows.h
+++ b/clang/lib/Driver/ToolChains/CrossWindows.h
@@ -54,7 +54,6 @@
   CrossWindowsToolChain(const Driver &D, const llvm::Triple &T,
                         const llvm::opt::ArgList &Args);
 
-  bool IsIntegratedAssemblerDefault() const override { return true; }
   UnwindTableLevel
   getDefaultUnwindTableLevel(const llvm::opt::ArgList &Args) const override;
   bool isPICDefault() const override;
diff --git a/clang/lib/Driver/ToolChains/Darwin.h b/clang/lib/Driver/ToolChains/Darwin.h
--- a/clang/lib/Driver/ToolChains/Darwin.h
+++ b/clang/lib/Driver/ToolChains/Darwin.h
@@ -238,10 +238,6 @@
     // expected to use /usr/include/Block.h.
     return true;
   }
-  bool IsIntegratedAssemblerDefault() const override {
-    // Default integrated assembler to on for Apple's MachO targets.
-    return true;
-  }
 
   bool IsMathErrnoDefault() const override { return false; }
 
diff --git a/clang/lib/Driver/ToolChains/Fuchsia.h b/clang/lib/Driver/ToolChains/Fuchsia.h
--- a/clang/lib/Driver/ToolChains/Fuchsia.h
+++ b/clang/lib/Driver/ToolChains/Fuchsia.h
@@ -55,7 +55,6 @@
           const llvm::opt::ArgList &Args);
 
   bool HasNativeLLVMSupport() const override { return true; }
-  bool IsIntegratedAssemblerDefault() const override { return true; }
   bool IsMathErrnoDefault() const override { return false; }
   bool useRelaxRelocations() const override { return true; };
   RuntimeLibType GetDefaultRuntimeLibType() const override {
diff --git a/clang/lib/Driver/ToolChains/HIPSPV.h b/clang/lib/Driver/ToolChains/HIPSPV.h
--- a/clang/lib/Driver/ToolChains/HIPSPV.h
+++ b/clang/lib/Driver/ToolChains/HIPSPV.h
@@ -79,7 +79,6 @@
 
   void adjustDebugInfoKind(llvm::codegenoptions::DebugInfoKind &DebugInfoKind,
                            const llvm::opt::ArgList &Args) const override;
-  bool IsIntegratedAssemblerDefault() const override { return true; }
   bool IsMathErrnoDefault() const override { return false; }
   bool useIntegratedAs() const override { return true; }
   bool isCrossCompiling() const override { return true; }
diff --git a/clang/lib/Driver/ToolChains/MSVC.h b/clang/lib/Driver/ToolChains/MSVC.h
--- a/clang/lib/Driver/ToolChains/MSVC.h
+++ b/clang/lib/Driver/ToolChains/MSVC.h
@@ -50,7 +50,6 @@
   TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
                 Action::OffloadKind DeviceOffloadKind) const override;
 
-  bool IsIntegratedAssemblerDefault() const override;
   UnwindTableLevel
   getDefaultUnwindTableLevel(const llvm::opt::ArgList &Args) const override;
   bool isPICDefault() const override;
diff --git a/clang/lib/Driver/ToolChains/MSVC.cpp b/clang/lib/Driver/ToolChains/MSVC.cpp
--- a/clang/lib/Driver/ToolChains/MSVC.cpp
+++ b/clang/lib/Driver/ToolChains/MSVC.cpp
@@ -463,10 +463,6 @@
   return nullptr;
 }
 
-bool MSVCToolChain::IsIntegratedAssemblerDefault() const {
-  return true;
-}
-
 ToolChain::UnwindTableLevel
 MSVCToolChain::getDefaultUnwindTableLevel(const ArgList &Args) const {
   // Don't emit unwind tables by default for MachO targets.
diff --git a/clang/lib/Driver/ToolChains/MinGW.h b/clang/lib/Driver/ToolChains/MinGW.h
--- a/clang/lib/Driver/ToolChains/MinGW.h
+++ b/clang/lib/Driver/ToolChains/MinGW.h
@@ -65,7 +65,6 @@
 
   bool HasNativeLLVMSupport() const override;
 
-  bool IsIntegratedAssemblerDefault() const override;
   UnwindTableLevel
   getDefaultUnwindTableLevel(const llvm::opt::ArgList &Args) const override;
   bool isPICDefault() const override;
diff --git a/clang/lib/Driver/ToolChains/MinGW.cpp b/clang/lib/Driver/ToolChains/MinGW.cpp
--- a/clang/lib/Driver/ToolChains/MinGW.cpp
+++ b/clang/lib/Driver/ToolChains/MinGW.cpp
@@ -518,8 +518,6 @@
           .equals_insensitive("lld");
 }
 
-bool toolchains::MinGW::IsIntegratedAssemblerDefault() const { return true; }
-
 Tool *toolchains::MinGW::getTool(Action::ActionClass AC) const {
   switch (AC) {
   case Action::PreprocessJobClass:
diff --git a/clang/lib/Driver/ToolChains/WebAssembly.h b/clang/lib/Driver/ToolChains/WebAssembly.h
--- a/clang/lib/Driver/ToolChains/WebAssembly.h
+++ b/clang/lib/Driver/ToolChains/WebAssembly.h
@@ -47,7 +47,6 @@
   bool isPICDefault() const override;
   bool isPIEDefault(const llvm::opt::ArgList &Args) const override;
   bool isPICDefaultForced() const override;
-  bool IsIntegratedAssemblerDefault() const override;
   bool hasBlocksRuntime() const override;
   bool SupportsProfiling() const override;
   bool HasNativeLLVMSupport() const override;
diff --git a/clang/lib/Driver/ToolChains/WebAssembly.cpp b/clang/lib/Driver/ToolChains/WebAssembly.cpp
--- a/clang/lib/Driver/ToolChains/WebAssembly.cpp
+++ b/clang/lib/Driver/ToolChains/WebAssembly.cpp
@@ -212,8 +212,6 @@
 
 bool WebAssembly::isPICDefaultForced() const { return false; }
 
-bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }
-
 bool WebAssembly::hasBlocksRuntime() const { return false; }
 
 // TODO: Support profiling.
diff --git a/clang/lib/Driver/ToolChains/XCore.h b/clang/lib/Driver/ToolChains/XCore.h
--- a/clang/lib/Driver/ToolChains/XCore.h
+++ b/clang/lib/Driver/ToolChains/XCore.h
@@ -57,6 +57,7 @@
   Tool *buildLinker() const override;
 
 public:
+  bool IsIntegratedAssemblerDefault() const override { return false; }
   bool isPICDefault() const override;
   bool isPIEDefault(const llvm::opt::ArgList &Args) const override;
   bool isPICDefaultForced() const override;
diff --git a/clang/lib/Driver/ToolChains/ZOS.h b/clang/lib/Driver/ToolChains/ZOS.h
--- a/clang/lib/Driver/ToolChains/ZOS.h
+++ b/clang/lib/Driver/ToolChains/ZOS.h
@@ -61,8 +61,6 @@
   }
   bool isPICDefaultForced() const override { return false; }
 
-  bool IsIntegratedAssemblerDefault() const override { return true; }
-
   void TryAddIncludeFromPath(llvm::SmallString<128> Path,
                              const llvm::opt::ArgList &DriverArgs,
                              llvm::opt::ArgStringList &CC1Args) const;