diff --git a/clang/lib/CodeGen/CGGPUBuiltin.cpp b/clang/lib/CodeGen/CGGPUBuiltin.cpp
--- a/clang/lib/CodeGen/CGGPUBuiltin.cpp
+++ b/clang/lib/CodeGen/CGGPUBuiltin.cpp
@@ -125,7 +125,7 @@
   }
 }
 
-bool containsNonScalarVarargs(CodeGenFunction *CGF, CallArgList Args) {
+bool containsNonScalarVarargs(CodeGenFunction *CGF, const CallArgList &Args) {
   return llvm::any_of(llvm::drop_begin(Args), [&](const CallArg &A) {
     return !A.getRValue(*CGF).isScalar();
   });
diff --git a/clang/lib/CodeGen/CGNonTrivialStruct.cpp b/clang/lib/CodeGen/CGNonTrivialStruct.cpp
--- a/clang/lib/CodeGen/CGNonTrivialStruct.cpp
+++ b/clang/lib/CodeGen/CGNonTrivialStruct.cpp
@@ -323,7 +323,7 @@
 template <size_t N, size_t... Ints>
 static std::array<Address, N> getParamAddrs(std::index_sequence<Ints...> IntSeq,
                                             std::array<CharUnits, N> Alignments,
-                                            FunctionArgList Args,
+                                            const FunctionArgList &Args,
                                             CodeGenFunction *CGF) {
   return std::array<Address, N>{
       {Address(CGF->Builder.CreateLoad(CGF->GetAddrOfLocalVar(Args[Ints])),
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -1711,7 +1711,7 @@
 
   /// Emit the module flag metadata used to pass options controlling the
   /// the backend to LLVM.
-  void EmitBackendOptionsMetadata(const CodeGenOptions CodeGenOpts);
+  void EmitBackendOptionsMetadata(const CodeGenOptions &CodeGenOpts);
 
   /// Emits OpenCL specific Metadata e.g. OpenCL version.
   void EmitOpenCLMetadata();
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -990,7 +990,7 @@
 }
 
 void CodeGenModule::EmitBackendOptionsMetadata(
-    const CodeGenOptions CodeGenOpts) {
+    const CodeGenOptions &CodeGenOpts) {
   if (getTriple().isRISCV()) {
     getModule().addModuleFlag(llvm::Module::Min, "SmallDataLimit",
                               CodeGenOpts.SmallDataLimit);
diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
--- a/clang/lib/Sema/SemaType.cpp
+++ b/clang/lib/Sema/SemaType.cpp
@@ -4553,7 +4553,7 @@
   return false;
 }
 
-static bool IsNoDerefableChunk(DeclaratorChunk Chunk) {
+static bool IsNoDerefableChunk(const DeclaratorChunk &Chunk) {
   return (Chunk.Kind == DeclaratorChunk::Pointer ||
           Chunk.Kind == DeclaratorChunk::Array);
 }