[LLDB] [PECOFF] Recognize arm64 executables

[compnerd]

lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp

202

Please use aarch64-unknown-windows.

[labath]

Since this (unlike most of your other patches in this series) is definitely adding new functionality, it would be good to accompany it with a test. The simplest way to do that should be via something like yaml2obj && lldb-test object-file | FileCheck. I'd recommend looking at lit/Modules/MachO/lc_version_min.yaml for inspiration.

lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp

case MachineX86:
     specs.Append(module_spec);
     spec.SetTriple("i686-pc-windows");
     specs.Append(module_spec);
     break;
   case MachineArmNt:
     spec.SetTriple("arm-pc-windows");
     specs.Append(module_spec);
     break;
+  case MachineArm64:
+    spec.SetTriple("aarch64-pc-windows");
+    specs.Append(module_spec);
+    break;
   default:
     break;
   }
 
   return specs.GetSize() - initial_count;
 }
 
 bool ObjectFilePECOFF::SaveCore(const lldb::ProcessSP &process_sp,
default:
     break;
   case llvm::COFF::IMAGE_FILE_MACHINE_AMD64:
   case llvm::COFF::IMAGE_FILE_MACHINE_I386:
   case llvm::COFF::IMAGE_FILE_MACHINE_POWERPC:
   case llvm::COFF::IMAGE_FILE_MACHINE_POWERPCFP:
   case llvm::COFF::IMAGE_FILE_MACHINE_ARM:
   case llvm::COFF::IMAGE_FILE_MACHINE_ARMNT:
   case llvm::COFF::IMAGE_FILE_MACHINE_THUMB:
+  case llvm::COFF::IMAGE_FILE_MACHINE_ARM64:
     ArchSpec arch;
     arch.SetArchitecture(eArchTypeCOFF, machine, LLDB_INVALID_CPUTYPE,
                          IsWindowsSubsystem() ? llvm::Triple::Win32
                                               : llvm::Triple::UnknownOS);
     return arch;
   }
   return ArchSpec();
 }