[llvm] [DebugInfo] Avoid repeated map lookups (NFC) (PR #128826)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-debuginfo

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/128826.diff


1 Files Affected:

- (modified) llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewVisitor.cpp (+3-4) 


``````````diff
diff --git a/llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewVisitor.cpp b/llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewVisitor.cpp
index 67aa71027687a..97214948d014a 100644
--- a/llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewVisitor.cpp
+++ b/llvm/lib/DebugInfo/LogicalView/Readers/LVCodeViewVisitor.cpp
@@ -268,10 +268,9 @@ class LVStringRecords {
 
   void add(TypeIndex TI, StringRef String) {
     static uint32_t Index = 0;
-    if (Strings.find(TI) == Strings.end())
-      Strings.emplace(
-          std::piecewise_construct, std::forward_as_tuple(TI),
-          std::forward_as_tuple(++Index, std::string(String), nullptr));
+    auto [It, Inserted] = Strings.try_emplace(TI);
+    if (Inserted)
+      It->second = std::make_tuple(++Index, std::string(String), nullptr);
   }
 
   StringRef find(TypeIndex TI) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/128826