[llvm] [SPARC] Implement L and H inline asm argument modifiers (PR #87259)

[Sergei Barannikov via llvm-commits]

================
@@ -434,6 +434,48 @@ bool SparcAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
     default:
       // See if this is a generic print operand
       return AsmPrinter::PrintAsmOperand(MI, OpNo, ExtraCode, O);
+    case 'L': // Low order register of a twin word register operand
+    case 'H': // High order register of a twin word register operand
+    {
+      if (OpNo == 0)
----------------
s-barannikov wrote:

Why is it silently skipped? This deserves a comment, at least.

https://github.com/llvm/llvm-project/pull/87259