[llvm] [DebugInfo] Avoid repeated hash lookups (NFC) (PR #128632)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/128632

None

>From 10c6547c9ced0969fe0004fa9e34a78b29b6f08d Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Mon, 24 Feb 2025 01:05:39 -0800
Subject: [PATCH] [DebugInfo] Avoid repeated hash lookups (NFC)

---
 llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewReader.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewReader.cpp b/llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewReader.cpp
index 6ce9bcbeb13c0..8074f1a9fddfb 100644
--- a/llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewReader.cpp
+++ b/llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewReader.cpp
@@ -721,12 +721,11 @@ Error LVCodeViewReader::traverseSymbolSection(StringRef SectionName,
                                    getFileName());
 
         LLVM_DEBUG({ W.printString("Symbol Name", SymbolName); });
-        if (FunctionLineTables.count(SymbolName) != 0) {
+        if (!FunctionLineTables.try_emplace(SymbolName, Contents).second) {
           // Saw debug info for this function already?
           return createStringError(object_error::parse_failed, getFileName());
         }
 
-        FunctionLineTables[SymbolName] = Contents;
         SymbolNames.push_back(SymbolName);
       }
       break;