[BinaryFormat] Add LoongArch

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D138018

llvm/lib/BinaryFormat/ELF.cpp

@@ -197,6 +197,7 @@ uint16_t ELF::convertArchNameToEMachine(StringRef Arch) {
       .Case("bpf", EM_BPF)
       .Case("ve", EM_VE)
       .Case("csky", EM_CSKY)
+      .Case("loongarch", EM_LOONGARCH)
       .Default(EM_NONE);
 }
 
@@ -561,6 +562,8 @@ StringRef ELF::convertEMachineToArchName(uint16_t EMachine) {
     return "ve";
   case EM_CSKY:
     return "csky";
+  case EM_LOONGARCH:
+    return "loongarch";
   default:
     return "None";
   }