[llvm] [CodeGen] Refactor `warn()` to use StringRef (PR #127537)

[via llvm-commits]

https://github.com/vortex73 updated https://github.com/llvm/llvm-project/pull/127537

>From ec284cfeb130c3e30937c14fc3a1d4b3a94dcc92 Mon Sep 17 00:00:00 2001
From: Narayan Sreekumar <nsreekumar6 at gmail.com>
Date: Tue, 18 Feb 2025 00:51:46 +0530
Subject: [PATCH] [CodeGen] Refactor warn() to use StringRef

---
 llvm/include/llvm/CGData/CodeGenData.h | 2 +-
 llvm/lib/CGData/CodeGenData.cpp        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/include/llvm/CGData/CodeGenData.h b/llvm/include/llvm/CGData/CodeGenData.h
index da0e412f2a0e0..0e7dd2f5b5c1a 100644
--- a/llvm/include/llvm/CGData/CodeGenData.h
+++ b/llvm/include/llvm/CGData/CodeGenData.h
@@ -265,7 +265,7 @@ std::unique_ptr<Module> loadModuleForTwoRounds(BitcodeModule &OrigModule,
 Expected<stable_hash> mergeCodeGenData(ArrayRef<StringRef> ObjectFiles);
 
 void warn(Error E, StringRef Whence = "");
-void warn(Twine Message, std::string Whence = "", std::string Hint = "");
+void warn(Twine Message, StringRef Whence = "", StringRef Hint = "");
 
 } // end namespace cgdata
 
diff --git a/llvm/lib/CGData/CodeGenData.cpp b/llvm/lib/CGData/CodeGenData.cpp
index 88dcdfd1f931a..c343013fc9a84 100644
--- a/llvm/lib/CGData/CodeGenData.cpp
+++ b/llvm/lib/CGData/CodeGenData.cpp
@@ -204,7 +204,7 @@ Expected<Header> Header::readFromBuffer(const unsigned char *Curr) {
 
 namespace cgdata {
 
-void warn(Twine Message, std::string Whence, std::string Hint) {
+void warn(Twine Message, StringRef Whence, StringRef Hint) {
   WithColor::warning();
   if (!Whence.empty())
     errs() << Whence << ": ";