Yet another fix llvm-objdump so it picks a good CPU based for Mach-O files,

in this case for CPU_SUBTYPE_ARM64_ALL.

For this cpusubtype it should default to a cyclone CPU
to give proper disassembly without a -mcpu= flag.

rdar://27767188

llvm-svn: 294771

llvm/lib/Object/MachOObjectFile.cpp

@@ -2477,6 +2477,8 @@ Triple MachOObjectFile::getArchTriple(uint32_t CPUType, uint32_t CPUSubType,
   case MachO::CPU_TYPE_ARM64:
     switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
     case MachO::CPU_SUBTYPE_ARM64_ALL:
+      if (McpuDefault)
+        *McpuDefault = "cyclone";
       if (ArchFlag)
         *ArchFlag = "arm64";
       return Triple("arm64-apple-darwin");