Index: clang/lib/CodeGen/CGGPUBuiltin.cpp
===================================================================
--- clang/lib/CodeGen/CGGPUBuiltin.cpp
+++ clang/lib/CodeGen/CGGPUBuiltin.cpp
@@ -125,7 +125,7 @@
   }
 }
 
-bool containsNonScalarVarargs(CodeGenFunction *CGF, CallArgList Args) {
+bool containsNonScalarVarargs(CodeGenFunction *CGF, CallArgList &Args) {
   return llvm::any_of(llvm::drop_begin(Args), [&](const CallArg &A) {
     return !A.getRValue(*CGF).isScalar();
   });
Index: clang/lib/CodeGen/CGNonTrivialStruct.cpp
===================================================================
--- clang/lib/CodeGen/CGNonTrivialStruct.cpp
+++ 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,
+                                            FunctionArgList &Args,
                                             CodeGenFunction *CGF) {
   return std::array<Address, N>{
       {Address(CGF->Builder.CreateLoad(CGF->GetAddrOfLocalVar(Args[Ints])),
Index: clang/lib/CodeGen/CodeGenAction.cpp
===================================================================
--- clang/lib/CodeGen/CodeGenAction.cpp
+++ clang/lib/CodeGen/CodeGenAction.cpp
@@ -86,7 +86,7 @@
   };
 
   static void reportOptRecordError(Error E, DiagnosticsEngine &Diags,
-                                   const CodeGenOptions CodeGenOpts) {
+                                   const CodeGenOptions &CodeGenOpts) {
     handleAllErrors(
         std::move(E),
       [&](const LLVMRemarkSetupFileError &E) {
Index: clang/lib/CodeGen/CodeGenModule.cpp
===================================================================
--- clang/lib/CodeGen/CodeGenModule.cpp
+++ 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);
Index: clang/lib/Frontend/ASTUnit.cpp
===================================================================
--- clang/lib/Frontend/ASTUnit.cpp
+++ clang/lib/Frontend/ASTUnit.cpp
@@ -2064,7 +2064,7 @@
 }
 
 void AugmentedCodeCompleteConsumer::ProcessCodeCompleteResults(Sema &S,
-                                            CodeCompletionContext Context,
+                                            CodeCompletionContext &Context,
                                             CodeCompletionResult *Results,
                                             unsigned NumResults) {
   // Merge the results we were given with the results we cached.
Index: clang/lib/Sema/CodeCompleteConsumer.cpp
===================================================================
--- clang/lib/Sema/CodeCompleteConsumer.cpp
+++ clang/lib/Sema/CodeCompleteConsumer.cpp
@@ -638,8 +638,8 @@
 }
 
 void PrintingCodeCompleteConsumer::ProcessCodeCompleteResults(
-    Sema &SemaRef, CodeCompletionContext Context, CodeCompletionResult *Results,
-    unsigned NumResults) {
+    Sema &SemaRef, CodeCompletionContext &Context,
+    CodeCompletionResult *Results, unsigned NumResults) {
   std::stable_sort(Results, Results + NumResults);
 
   if (!Context.getPreferredType().isNull())
Index: clang/lib/Sema/SemaCodeComplete.cpp
===================================================================
--- clang/lib/Sema/SemaCodeComplete.cpp
+++ clang/lib/Sema/SemaCodeComplete.cpp
@@ -4148,7 +4148,7 @@
 
 static void HandleCodeCompleteResults(Sema *S,
                                       CodeCompleteConsumer *CodeCompleter,
-                                      CodeCompletionContext Context,
+                                      CodeCompletionContext &Context,
                                       CodeCompletionResult *Results,
                                       unsigned NumResults) {
   if (CodeCompleter)
Index: clang/lib/Sema/SemaConcept.cpp
===================================================================
--- clang/lib/Sema/SemaConcept.cpp
+++ clang/lib/Sema/SemaConcept.cpp
@@ -160,7 +160,7 @@
   Sema &SemaRef;
   bool Inserted = false;
   SatisfactionStackRAII(Sema &SemaRef, const NamedDecl *ND,
-                        llvm::FoldingSetNodeID FSNID)
+                        llvm::FoldingSetNodeID &FSNID)
       : SemaRef(SemaRef) {
       if (ND) {
       SemaRef.PushSatisfactionStackEntry(ND, FSNID);
@@ -1370,7 +1370,7 @@
 }
 
 template<typename AtomicSubsumptionEvaluator>
-static bool subsumes(NormalForm PDNF, NormalForm QCNF,
+static bool subsumes(NormalForm &PDNF, NormalForm &QCNF,
                      AtomicSubsumptionEvaluator E) {
   // C++ [temp.constr.order] p2
   //   Then, P subsumes Q if and only if, for every disjunctive clause Pi in the
Index: clang/lib/Sema/SemaInit.cpp
===================================================================
--- clang/lib/Sema/SemaInit.cpp
+++ clang/lib/Sema/SemaInit.cpp
@@ -5287,7 +5287,7 @@
   // Process entities (i.e. array members, base classes, or class fields) by
   // adding an initialization expression to InitExprs for each entity to
   // initialize.
-  auto ProcessEntities = [&](auto Range) -> bool {
+  auto ProcessEntities = [&](auto &Range) -> bool {
     bool IsUnionType = Entity.getType()->isUnionType();
     for (InitializedEntity SubEntity : Range) {
       // Unions should only have one initializer expression.
Index: clang/lib/Serialization/GlobalModuleIndex.cpp
===================================================================
--- clang/lib/Serialization/GlobalModuleIndex.cpp
+++ clang/lib/Serialization/GlobalModuleIndex.cpp
@@ -127,7 +127,7 @@
 
 GlobalModuleIndex::GlobalModuleIndex(
     std::unique_ptr<llvm::MemoryBuffer> IndexBuffer,
-    llvm::BitstreamCursor Cursor)
+    llvm::BitstreamCursor &Cursor)
     : Buffer(std::move(IndexBuffer)), IdentifierIndex(), NumIdentifierLookups(),
       NumIdentifierLookupHits() {
   auto Fail = [&](llvm::Error &&Err) {