Add support for ARM64 architecture in FileInfo

struct and machoFile

Author: derekparker

file.go

@@ -391,6 +391,7 @@ type FileInfo struct {
 const (
 	ArchAMD64 = "amd64"
 	ArchARM   = "arm"
+	ArchARM64 = "arm64"
 	Arch386   = "i386"
 	ArchMIPS  = "mips"
 )

macho.go

@@ -113,6 +113,9 @@ func (m *machoFile) getFileInfo() *FileInfo {
 	case macho.CpuAmd64:
 		fi.WordSize = intSize64
 		fi.Arch = ArchAMD64
+	case macho.CpuArm64:
+		fi.WordSize = intSize64
+		fi.Arch = ArchARM64
 	default:
 		panic("Unsupported architecture")
 	}