[Clang][AMDGPU] Handle builtin types more generically. NFC. (#109004)

Tweak encodeTypeForFunctionPointerAuth to handle all AMDGPU builtin
types generically instead of just __amdgpu_buffer_rsrc_t which happens
to be the only one defined so far.

Author: jayfoad

clang/lib/AST/ASTContext.cpp

@@ -3377,7 +3377,8 @@ static void encodeTypeForFunctionPointerAuth(const ASTContext &Ctx,
 #include "clang/Basic/HLSLIntangibleTypes.def"
     case BuiltinType::Dependent:
       llvm_unreachable("should never get here");
-    case BuiltinType::AMDGPUBufferRsrc:
+#define AMDGPU_TYPE(Name, Id, SingletonId) case BuiltinType::Id:
+#include "clang/Basic/AMDGPUTypes.def"
     case BuiltinType::WasmExternRef:
 #define RVV_TYPE(Name, Id, SingletonId) case BuiltinType::Id:
 #include "clang/Basic/RISCVVTypes.def"