[llvm] [LLVM][TableGen] Use `StringRef` for CodeGenInstruction::AsmString (PR #144440)

[Rahul Joshi via llvm-commits]

https://github.com/jurahul created https://github.com/llvm/llvm-project/pull/144440

None

>From 0907cdbbd4f0c408da9d36640de639c01dcb0605 Mon Sep 17 00:00:00 2001
From: Rahul Joshi <rjoshi at nvidia.com>
Date: Mon, 16 Jun 2025 14:48:36 -0700
Subject: [PATCH] [LLVM][TableGen] Use `StringRef` for
 CodeGenInstruction::AsmString

---
 llvm/utils/TableGen/Common/CodeGenInstruction.cpp | 2 +-
 llvm/utils/TableGen/Common/CodeGenInstruction.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/utils/TableGen/Common/CodeGenInstruction.cpp b/llvm/utils/TableGen/Common/CodeGenInstruction.cpp
index 0dfcf200d7e4b..2ec3683e116e9 100644
--- a/llvm/utils/TableGen/Common/CodeGenInstruction.cpp
+++ b/llvm/utils/TableGen/Common/CodeGenInstruction.cpp
@@ -435,7 +435,7 @@ void CGIOperandList::ProcessDisableEncoding(StringRef DisableEncoding) {
 CodeGenInstruction::CodeGenInstruction(const Record *R)
     : TheDef(R), Operands(R), InferredFrom(nullptr) {
   Namespace = R->getValueAsString("Namespace");
-  AsmString = R->getValueAsString("AsmString").str();
+  AsmString = R->getValueAsString("AsmString");
 
   isPreISelOpcode = R->getValueAsBit("isPreISelOpcode");
   isReturn = R->getValueAsBit("isReturn");
diff --git a/llvm/utils/TableGen/Common/CodeGenInstruction.h b/llvm/utils/TableGen/Common/CodeGenInstruction.h
index 3a5abc55319b1..0db12b551b437 100644
--- a/llvm/utils/TableGen/Common/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/Common/CodeGenInstruction.h
@@ -226,7 +226,7 @@ class CodeGenInstruction {
 
   /// AsmString - The format string used to emit a .s file for the
   /// instruction.
-  std::string AsmString;
+  StringRef AsmString;
 
   /// Operands - This is information about the (ins) and (outs) list specified
   /// to the instruction.