Fix Passing TargetOptions by Value in TargetMachines for AMDGPU (#79866)

`TargetOptions` is currently passed by value in AMDGPU targets, which
makes unnecessary copies. This PR fixes this issue.

Author: matinraayai

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

@@ -571,7 +571,7 @@ static Reloc::Model getEffectiveRelocModel(std::optional<Reloc::Model> RM) {
 
 AMDGPUTargetMachine::AMDGPUTargetMachine(const Target &T, const Triple &TT,
                                          StringRef CPU, StringRef FS,
-                                         TargetOptions Options,
+                                         const TargetOptions &Options,
                                          std::optional<Reloc::Model> RM,
                                          std::optional<CodeModel::Model> CM,
                                          CodeGenOptLevel OptLevel)
@@ -863,7 +863,7 @@ AMDGPUTargetMachine::getAddressSpaceForPseudoSourceKind(unsigned Kind) const {
 
 GCNTargetMachine::GCNTargetMachine(const Target &T, const Triple &TT,
                                    StringRef CPU, StringRef FS,
-                                   TargetOptions Options,
+                                   const TargetOptions &Options,
                                    std::optional<Reloc::Model> RM,
                                    std::optional<CodeModel::Model> CM,
                                    CodeGenOptLevel OL, bool JIT)

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h

@@ -39,7 +39,7 @@ class AMDGPUTargetMachine : public LLVMTargetMachine {
   static bool EnableLowerModuleLDS;
 
   AMDGPUTargetMachine(const Target &T, const Triple &TT, StringRef CPU,
-                      StringRef FS, TargetOptions Options,
+                      StringRef FS, const TargetOptions &Options,
                       std::optional<Reloc::Model> RM,
                       std::optional<CodeModel::Model> CM, CodeGenOptLevel OL);
   ~AMDGPUTargetMachine() override;
@@ -78,7 +78,7 @@ class GCNTargetMachine final : public AMDGPUTargetMachine {
 
 public:
   GCNTargetMachine(const Target &T, const Triple &TT, StringRef CPU,
-                   StringRef FS, TargetOptions Options,
+                   StringRef FS, const TargetOptions &Options,
                    std::optional<Reloc::Model> RM,
                    std::optional<CodeModel::Model> CM, CodeGenOptLevel OL,
                    bool JIT);

llvm/lib/Target/AMDGPU/R600TargetMachine.cpp

@@ -50,7 +50,7 @@ static MachineSchedRegistry R600SchedRegistry("r600",
 
 R600TargetMachine::R600TargetMachine(const Target &T, const Triple &TT,
                                      StringRef CPU, StringRef FS,
-                                     TargetOptions Options,
+                                     const TargetOptions &Options,
                                      std::optional<Reloc::Model> RM,
                                      std::optional<CodeModel::Model> CM,
                                      CodeGenOptLevel OL, bool JIT)

llvm/lib/Target/AMDGPU/R600TargetMachine.h

@@ -31,7 +31,7 @@ class R600TargetMachine final : public AMDGPUTargetMachine {
 
 public:
   R600TargetMachine(const Target &T, const Triple &TT, StringRef CPU,
-                    StringRef FS, TargetOptions Options,
+                    StringRef FS, const TargetOptions &Options,
                     std::optional<Reloc::Model> RM,
                     std::optional<CodeModel::Model> CM, CodeGenOptLevel OL,
                     bool JIT);