[AMDGPU] clang-tidy: replace macro with enum. NFC.

Author: jayfoad

llvm/lib/Target/AMDGPU/AMDGPUPrintfRuntimeBinding.cpp

@@ -34,7 +34,7 @@
 using namespace llvm;
 
 #define DEBUG_TYPE "printfToRuntime"
-#define DWORD_ALIGN 4
+enum { DWORD_ALIGN = 4 };
 
 namespace {
 class AMDGPUPrintfRuntimeBinding final : public ModulePass {

llvm/lib/Target/AMDGPU/R600MachineCFGStructurizer.cpp

@@ -24,7 +24,7 @@ using namespace llvm;
 
 #define DEBUG_TYPE "structcfg"
 
-#define DEFAULT_VEC_SLOTS 8
+enum { DEFAULT_VEC_SLOTS = 8 };
 
 // TODO: move-begin.
 

llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.cpp

@@ -26,7 +26,7 @@
 #include <optional>
 #include <vector>
 
-#define MAX_LANES 64
+enum { MAX_LANES = 64 };
 
 using namespace llvm;