[CodeView] Fix the ARM64 CPUType enum

[mstorsjo]

Summary

The old, incorrect one seems to have been added in
d41ac895bb810d0b15844773cbecbf394d914010, with a similarly placed
entry added in EnumTables.cpp in
eb4d6142dcd53d79d8f8a86908a035582965fc52.

This matches the value documented at
https://docs.microsoft.com/en-us/visualstudio/debugger/debug-interface-access/cv-cpu-type-e?view=vs-2019.

This fixes running obj2yaml on an object file generated by MSVC.

Not sure what would be an appropriate test for this - anything
involving yaml2obj doesn't do much, as the yaml only encodes the
textual value (while this patch changes what numerical value it is
mapped to).

[TomTan]

Thanks, LGTM.

[rnk]

lgtm

llvm/include/llvm/DebugInfo/CodeView/CodeView.h

125–126

I noticed that ARM7 is not in the docs either, but it is present in the cvconst.h header here:
https://github.com/microsoft/microsoft-pdb/blob/master/include/cvconst.h#L374
*shrug*

llvm/include/llvm/DebugInfo/CodeView/CodeView.h

enum class CPUType : uint16_t {
   ARM3 = 0x60,
   ARM4 = 0x61,
   ARM4T = 0x62,
   ARM5 = 0x63,
   ARM5T = 0x64,
   ARM6 = 0x65,
   ARM_XMAC = 0x66,
   ARM_WMMX = 0x67,
   ARM7 = 0x68,
-  ARM64 = 0x69,
   Omni = 0x70,
   Ia64 = 0x80,
   Ia64_2 = 0x81,
   CEE = 0x90,
   AM33 = 0xa0,
   M32R = 0xb0,
   TriCore = 0xc0,
   X64 = 0xd0,
   EBC = 0xe0,
   Thumb = 0xf0,
   ARMNT = 0xf4,
+  ARM64 = 0xf6,
   D3D11_Shader = 0x100,
 };
 
 /// These values correspond to the CV_CFL_LANG enumeration, and are documented
 /// here: https://msdn.microsoft.com/en-us/library/bw3aekw6.aspx
 enum SourceLanguage : uint8_t {
   C = 0x00,
   Cpp = 0x01,

llvm/lib/DebugInfo/CodeView/EnumTables.cpp

static const EnumEntry<unsigned> CPUTypeNames[] = {
     CV_ENUM_CLASS_ENT(CPUType, ARM4),
     CV_ENUM_CLASS_ENT(CPUType, ARM4T),
     CV_ENUM_CLASS_ENT(CPUType, ARM5),
     CV_ENUM_CLASS_ENT(CPUType, ARM5T),
     CV_ENUM_CLASS_ENT(CPUType, ARM6),
     CV_ENUM_CLASS_ENT(CPUType, ARM_XMAC),
     CV_ENUM_CLASS_ENT(CPUType, ARM_WMMX),
     CV_ENUM_CLASS_ENT(CPUType, ARM7),
-    CV_ENUM_CLASS_ENT(CPUType, ARM64),
     CV_ENUM_CLASS_ENT(CPUType, Omni),
     CV_ENUM_CLASS_ENT(CPUType, Ia64),
     CV_ENUM_CLASS_ENT(CPUType, Ia64_2),
     CV_ENUM_CLASS_ENT(CPUType, CEE),
     CV_ENUM_CLASS_ENT(CPUType, AM33),
     CV_ENUM_CLASS_ENT(CPUType, M32R),
     CV_ENUM_CLASS_ENT(CPUType, TriCore),
     CV_ENUM_CLASS_ENT(CPUType, X64),
     CV_ENUM_CLASS_ENT(CPUType, EBC),
     CV_ENUM_CLASS_ENT(CPUType, Thumb),
     CV_ENUM_CLASS_ENT(CPUType, ARMNT),
+    CV_ENUM_CLASS_ENT(CPUType, ARM64),
     CV_ENUM_CLASS_ENT(CPUType, D3D11_Shader),
 };
 
 static const EnumEntry<uint32_t> FrameProcSymFlagNames[] = {
     CV_ENUM_CLASS_ENT(FrameProcedureOptions, HasAlloca),
     CV_ENUM_CLASS_ENT(FrameProcedureOptions, HasSetJmp),
     CV_ENUM_CLASS_ENT(FrameProcedureOptions, HasLongJmp),
     CV_ENUM_CLASS_ENT(FrameProcedureOptions, HasInlineAssembly),