diff --git a/llvm/include/llvm/IR/IRBuilder.h b/llvm/include/llvm/IR/IRBuilder.h
--- a/llvm/include/llvm/IR/IRBuilder.h
+++ b/llvm/include/llvm/IR/IRBuilder.h
@@ -984,6 +984,10 @@
     SetInsertPoint(TheBB, IP);
   }
 
+  /// Avoid copying the full IRBuilder. Prefer using InsertPointGuard
+  /// or FastMathFlagGuard instead.
+  IRBuilder(const IRBuilder &) = delete;
+
   /// Get the constant folder being used.
   const T &getFolder() { return Folder; }
 
diff --git a/llvm/lib/IR/DIBuilder.cpp b/llvm/lib/IR/DIBuilder.cpp
--- a/llvm/lib/IR/DIBuilder.cpp
+++ b/llvm/lib/IR/DIBuilder.cpp
@@ -895,18 +895,15 @@
   return insertDbgValueIntrinsic(V, VarInfo, Expr, DL, InsertAtEnd, nullptr);
 }
 
-/// Return an IRBuilder for inserting dbg.declare and dbg.value intrinsics. This
-/// abstracts over the various ways to specify an insert position.
-static IRBuilder<> getIRBForDbgInsertion(const DILocation *DL,
-                                         BasicBlock *InsertBB,
-                                         Instruction *InsertBefore) {
-  IRBuilder<> B(DL->getContext());
+/// Initialize IRBuilder for inserting dbg.declare and dbg.value intrinsics.
+/// This abstracts over the various ways to specify an insert position.
+static void initIRBuilder(IRBuilder<> &Builder, const DILocation *DL,
+                          BasicBlock *InsertBB, Instruction *InsertBefore) {
   if (InsertBefore)
-    B.SetInsertPoint(InsertBefore);
+    Builder.SetInsertPoint(InsertBefore);
   else if (InsertBB)
-    B.SetInsertPoint(InsertBB);
-  B.SetCurrentDebugLocation(DL);
-  return B;
+    Builder.SetInsertPoint(InsertBB);
+  Builder.SetCurrentDebugLocation(DL);
 }
 
 static Value *getDbgIntrinsicValueImpl(LLVMContext &VMContext, Value *V) {
@@ -936,7 +933,8 @@
                    MetadataAsValue::get(VMContext, VarInfo),
                    MetadataAsValue::get(VMContext, Expr)};
 
-  IRBuilder<> B = getIRBForDbgInsertion(DL, InsertBB, InsertBefore);
+  IRBuilder<> B(DL->getContext());
+  initIRBuilder(B, DL, InsertBB, InsertBefore);
   return B.CreateCall(DeclareFn, Args);
 }
 
@@ -958,7 +956,8 @@
                    MetadataAsValue::get(VMContext, VarInfo),
                    MetadataAsValue::get(VMContext, Expr)};
 
-  IRBuilder<> B = getIRBForDbgInsertion(DL, InsertBB, InsertBefore);
+  IRBuilder<> B(DL->getContext());
+  initIRBuilder(B, DL, InsertBB, InsertBefore);
   return B.CreateCall(ValueFn, Args);
 }
 
@@ -976,7 +975,8 @@
   trackIfUnresolved(LabelInfo);
   Value *Args[] = {MetadataAsValue::get(VMContext, LabelInfo)};
 
-  IRBuilder<> B = getIRBForDbgInsertion(DL, InsertBB, InsertBefore);
+  IRBuilder<> B(DL->getContext());
+  initIRBuilder(B, DL, InsertBB, InsertBefore);
   return B.CreateCall(LabelFn, Args);
 }
 
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -27717,7 +27717,7 @@
         AI->use_empty())
       return nullptr;
 
-  auto Builder = IRBuilder<>(AI);
+  IRBuilder<> Builder(AI);
   Module *M = Builder.GetInsertBlock()->getParent()->getParent();
   auto SSID = AI->getSyncScopeID();
   // We must restrict the ordering to avoid generating loads with Release or
diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -787,7 +787,7 @@
                                        StringRef OriginalName);
   void SetComdatForGlobalMetadata(GlobalVariable *G, GlobalVariable *Metadata,
                                   StringRef InternalSuffix);
-  IRBuilder<> CreateAsanModuleDtor(Module &M);
+  Instruction *CreateAsanModuleDtor(Module &M);
 
   bool ShouldInstrumentGlobal(GlobalVariable *G);
   bool ShouldUseMachOGlobalsSection() const;
@@ -2030,13 +2030,13 @@
   return Metadata;
 }
 
-IRBuilder<> ModuleAddressSanitizer::CreateAsanModuleDtor(Module &M) {
+Instruction *ModuleAddressSanitizer::CreateAsanModuleDtor(Module &M) {
   AsanDtorFunction =
       Function::Create(FunctionType::get(Type::getVoidTy(*C), false),
                        GlobalValue::InternalLinkage, kAsanModuleDtorName, &M);
   BasicBlock *AsanDtorBB = BasicBlock::Create(*C, "", AsanDtorFunction);
 
-  return IRBuilder<>(ReturnInst::Create(*C, AsanDtorBB));
+  return ReturnInst::Create(*C, AsanDtorBB);
 }
 
 void ModuleAddressSanitizer::InstrumentGlobalsCOFF(
@@ -2115,7 +2115,7 @@
 
   // We also need to unregister globals at the end, e.g., when a shared library
   // gets closed.
-  IRBuilder<> IRB_Dtor = CreateAsanModuleDtor(M);
+  IRBuilder<> IRB_Dtor(CreateAsanModuleDtor(M));
   IRB_Dtor.CreateCall(AsanUnregisterElfGlobals,
                       {IRB.CreatePointerCast(RegisteredFlag, IntptrTy),
                        IRB.CreatePointerCast(StartELFMetadata, IntptrTy),
@@ -2174,7 +2174,7 @@
 
   // We also need to unregister globals at the end, e.g., when a shared library
   // gets closed.
-  IRBuilder<> IRB_Dtor = CreateAsanModuleDtor(M);
+  IRBuilder<> IRB_Dtor(CreateAsanModuleDtor(M));
   IRB_Dtor.CreateCall(AsanUnregisterImageGlobals,
                       {IRB.CreatePointerCast(RegisteredFlag, IntptrTy)});
 }
@@ -2202,7 +2202,7 @@
 
   // We also need to unregister globals at the end, e.g., when a shared library
   // gets closed.
-  IRBuilder<> IRB_Dtor = CreateAsanModuleDtor(M);
+  IRBuilder<> IRB_Dtor(CreateAsanModuleDtor(M));
   IRB_Dtor.CreateCall(AsanUnregisterGlobals,
                       {IRB.CreatePointerCast(AllGlobals, IntptrTy),
                        ConstantInt::get(IntptrTy, N)});