[COFF, ARM64] Set the data type widths and the data layout string

[mgrang]

Summary

COFF ARM64 is LLP64 platform. So int is 4 bytes, long is 4 bytes and long long is 8 bytes.

[compnerd]

Can you please double check the type of long double as well?

lib/Basic/Targets.cpp

6583

Typo: platform.

[mgrang]

Fixed typo.
Added size for long double.
Added test cases.

[efriedma]

lib/Basic/Targets.cpp

6589

If you're changing LongDoubleWidth and LongDoubleAlign, you also have to change LongDoubleFormat.

[efriedma]

LGTM

lib/Basic/Targets.cpp

 class MicrosoftARM64TargetInfo
     : public WindowsTargetInfo<AArch64leTargetInfo> {
   const llvm::Triple Triple;
 
 public:
   MicrosoftARM64TargetInfo(const llvm::Triple &Triple,
                              const TargetOptions &Opts)
       : WindowsTargetInfo<AArch64leTargetInfo>(Triple, Opts), Triple(Triple) {
+
+    // This is an LLP64 paltform.
+    // int:4, long:4, long long:8.
     WCharType = UnsignedShort;
+    IntWidth = IntAlign = 32;
+    LongWidth = LongAlign = 32;
+    DoubleAlign = LongLongAlign = 64;
+    IntMaxType = SignedLongLong;
+    Int64Type = SignedLongLong;
     SizeType = UnsignedLongLong;
+    PtrDiffType = SignedLongLong;
+    IntPtrType = SignedLongLong;
+
     TheCXXABI.set(TargetCXXABI::Microsoft);
   }
 
   void setDataLayout() override {
-    resetDataLayout("e-m:w-i64:64-i128:128-n32:64-S128");
+    resetDataLayout("e-m:w-p:64:64-i32:32-i64:64-i128:128:128");
   }
 
   void getVisualStudioDefines(const LangOptions &Opts,
                               MacroBuilder &Builder) const {
     WindowsTargetInfo<AArch64leTargetInfo>::getVisualStudioDefines(Opts,
                                                                    Builder);
     Builder.defineMacro("_WIN32", "1");
     Builder.defineMacro("_WIN64", "1");