[MachO] Add new constants for visionOS platforms

[keith]

llvm/include/llvm/Object/MachO.h

798

Apple's tools actually report xrOS at this point, we might want to wait until later in the beta cycle to match whatever they end up with if they do a rename

[keith]

looks like i'll have to add the Triple too if we wanted to land this

[keith]

sounds like this should come from the apple folks at some point

llvm/include/llvm/BinaryFormat/MachO.h

enum PlatformType {
   PLATFORM_TVOS = 3,
   PLATFORM_WATCHOS = 4,
   PLATFORM_BRIDGEOS = 5,
   PLATFORM_MACCATALYST = 6,
   PLATFORM_IOSSIMULATOR = 7,
   PLATFORM_TVOSSIMULATOR = 8,
   PLATFORM_WATCHOSSIMULATOR = 9,
   PLATFORM_DRIVERKIT = 10,
+  PLATFORM_VISIONOS = 11,
+  PLATFORM_VISIONOSSIMULATOR = 12,
 };
 
 // Values for tools enum in build_tool_version.
 enum { TOOL_CLANG = 1, TOOL_SWIFT = 2, TOOL_LD = 3, TOOL_LLD = 4 };
 
 // Structs from <mach-o/loader.h>
 
 struct mach_header {

llvm/include/llvm/Object/MachO.h

static std::string getBuildPlatform(uint32_t platform) {
     case MachO::PLATFORM_TVOS: return "tvos";
     case MachO::PLATFORM_WATCHOS: return "watchos";
     case MachO::PLATFORM_BRIDGEOS: return "bridgeos";
     case MachO::PLATFORM_MACCATALYST: return "macCatalyst";
     case MachO::PLATFORM_IOSSIMULATOR: return "iossimulator";
     case MachO::PLATFORM_TVOSSIMULATOR: return "tvossimulator";
     case MachO::PLATFORM_WATCHOSSIMULATOR: return "watchossimulator";
     case MachO::PLATFORM_DRIVERKIT: return "driverkit";
+    case MachO::PLATFORM_VISIONOS:
+      return "visionos";
+    case MachO::PLATFORM_VISIONOSSIMULATOR:
+      return "visionossimulator";
     default:
       std::string ret;
       raw_string_ostream ss(ret);
       ss << format_hex(platform, 8, true);
       return ss.str();
     }
   }