[llvm] [MC] Add .loc_label instruction (PR #99710)

[Fangrui Song via llvm-commits]

================
@@ -3733,6 +3737,19 @@ bool AsmParser::parseDirectiveLoc() {
   return false;
 }
 
+/// parseDirectiveLoc
+/// ::= .loc_label label
+bool AsmParser::parseDirectiveLocLabel(SMLoc DirectiveLoc) {
+  StringRef Name;
+  DirectiveLoc = Lexer.getLoc();
+  if (parseIdentifier(Name))
+    return TokError("expected identifier");
----------------
MaskRay wrote:

no parsing error test. `rg ERR=1 llvm/test/MC/ELF` for some examples.

https://github.com/llvm/llvm-project/pull/99710