[llvm] [llvm-profgen] Formatting StringRef iteration in isLBRSample (PR #211462)

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<!--LLVM PR SUMMARY COMMENT-->

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Author: HighW4y2H3ll

<details>
<summary>Changes</summary>

Follow up on https://github.com/llvm/llvm-project/pull/211182 Cleanup the StringRef iteration.

---
Full diff: https://github.com/llvm/llvm-project/pull/211462.diff


1 Files Affected:

- (modified) llvm/tools/llvm-profgen/PerfReader.cpp (+1-1) 


``````````diff
diff --git a/llvm/tools/llvm-profgen/PerfReader.cpp b/llvm/tools/llvm-profgen/PerfReader.cpp
index 976063ecbe98d..5fb1c6d252915 100644
--- a/llvm/tools/llvm-profgen/PerfReader.cpp
+++ b/llvm/tools/llvm-profgen/PerfReader.cpp
@@ -1182,7 +1182,7 @@ bool PerfScriptReader::isLBRSample(StringRef Line, bool CheckLineStart) {
   // Line might start with IP or only contain brstack. Check first two records
   // and fail if no record exists.
   Line.split(Records, " ", 2, CheckLineStart);
-  for (const StringRef &Record : Records)
+  for (StringRef Record : Records)
     if (Record.starts_with("0x") && Record.contains('/'))
       return true;
   return false;

``````````

</details>


https://github.com/llvm/llvm-project/pull/211462