[llvm] [DWARF] Avoid repeated hash lookups (NFC) (PR #110202)

[via llvm-commits]

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/110202.diff


1 Files Affected:

- (modified) llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp (+2-4) 


``````````diff
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp b/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
index eb2751ab30ac50..fa3e8ad21dbd4d 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFVerifier.cpp
@@ -1014,10 +1014,8 @@ void DWARFVerifier::verifyDebugLineRows() {
           DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath, FullPath);
       assert(HasFullPath && "Invalid index?");
       (void)HasFullPath;
-      auto It = FullPathMap.find(FullPath);
-      if (It == FullPathMap.end())
-        FullPathMap[FullPath] = FileIndex;
-      else if (It->second != FileIndex && DumpOpts.Verbose) {
+      auto [It, Inserted] = FullPathMap.try_emplace(FullPath, FileIndex);
+      if (!Inserted && It->second != FileIndex && DumpOpts.Verbose) {
         warn() << ".debug_line["
                << format("0x%08" PRIx64,
                          *toSectionOffset(Die.find(DW_AT_stmt_list)))

``````````

</details>


https://github.com/llvm/llvm-project/pull/110202