[NFC][clang] Rename clang/lib/CodeGen/TargetBuiltins/* files to avoid build warnings on macOS

Signed-off-by: yronglin <[email protected]>

Author: yronglin

clang/lib/CodeGen/CMakeLists.txt

@@ -117,17 +117,17 @@ add_clang_library(clangCodeGen
   PatternInit.cpp
   SanitizerMetadata.cpp
   SwiftCallingConv.cpp
-  TargetBuiltins/ARM.cpp
-  TargetBuiltins/AMDGPU.cpp
-  TargetBuiltins/DirectX.cpp
-  TargetBuiltins/Hexagon.cpp
-  TargetBuiltins/NVPTX.cpp
-  TargetBuiltins/PPC.cpp
-  TargetBuiltins/RISCV.cpp
-  TargetBuiltins/SPIR.cpp
-  TargetBuiltins/SystemZ.cpp
-  TargetBuiltins/WebAssembly.cpp
-  TargetBuiltins/X86.cpp
+  TargetBuiltins/TargetBuiltinsARM.cpp
+  TargetBuiltins/TargetBuiltinsAMDGPU.cpp
+  TargetBuiltins/TargetBuiltinsDirectX.cpp
+  TargetBuiltins/TargetBuiltinsHexagon.cpp
+  TargetBuiltins/TargetBuiltinsNVPTX.cpp
+  TargetBuiltins/TargetBuiltinsPPC.cpp
+  TargetBuiltins/TargetBuiltinsRISCV.cpp
+  TargetBuiltins/TargetBuiltinsSPIR.cpp
+  TargetBuiltins/TargetBuiltinsSystemZ.cpp
+  TargetBuiltins/TargetBuiltinsWebAssembly.cpp
+  TargetBuiltins/TargetBuiltinsX86.cpp
   TargetInfo.cpp
   Targets/AArch64.cpp
   Targets/AMDGPU.cpp