[Clang][OHOS] Keep ARM ABI selection logic in sync between Clang and LLVM (#68656)

Author: brad0

clang/lib/Basic/Targets/ARM.cpp

@@ -258,6 +258,7 @@ ARMTargetInfo::ARMTargetInfo(const llvm::Triple &Triple,
   bool IsOpenBSD = Triple.isOSOpenBSD();
   bool IsNetBSD = Triple.isOSNetBSD();
   bool IsHaiku = Triple.isOSHaiku();
+  bool IsOHOS = Triple.isOHOSFamily();
 
   // FIXME: the isOSBinFormatMachO is a workaround for identifying a Darwin-like
   // environment where size_t is `unsigned long` rather than `unsigned int`
@@ -324,7 +325,7 @@ ARMTargetInfo::ARMTargetInfo(const llvm::Triple &Triple,
     default:
       if (IsNetBSD)
         setABI("apcs-gnu");
-      else if (IsFreeBSD || IsOpenBSD || IsHaiku)
+      else if (IsFreeBSD || IsOpenBSD || IsHaiku || IsOHOS)
         setABI("aapcs-linux");
       else
         setABI("aapcs");

llvm/lib/TargetParser/ARMTargetParser.cpp

@@ -559,6 +559,7 @@ StringRef ARM::computeDefaultTargetABI(const Triple &TT, StringRef CPU) {
   case Triple::GNUEABIHF:
   case Triple::MuslEABI:
   case Triple::MuslEABIHF:
+  case Triple::OpenHOS:
     return "aapcs-linux";
   case Triple::EABIHF:
   case Triple::EABI: