[llvm] [dsymutil] Avoid repeated hash lookups (NFC) (PR #127449)

[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/127449.diff


1 Files Affected:

- (modified) llvm/tools/dsymutil/BinaryHolder.cpp (+2-4) 


``````````diff
diff --git a/llvm/tools/dsymutil/BinaryHolder.cpp b/llvm/tools/dsymutil/BinaryHolder.cpp
index 7588a33eb46b2..9429afeefa642 100644
--- a/llvm/tools/dsymutil/BinaryHolder.cpp
+++ b/llvm/tools/dsymutil/BinaryHolder.cpp
@@ -288,15 +288,13 @@ void BinaryHolder::eraseObjectEntry(StringRef Filename) {
   if (isArchive(Filename)) {
     StringRef ArchiveFilename = getArchiveAndObjectName(Filename).first;
     std::lock_guard<std::mutex> Lock(ArchiveCacheMutex);
-    ArchiveRefCounter[ArchiveFilename]--;
-    if (ArchiveRefCounter[ArchiveFilename] == 0)
+    if (--ArchiveRefCounter[ArchiveFilename] == 0)
       ArchiveCache.erase(ArchiveFilename);
     return;
   }
 
   std::lock_guard<std::mutex> Lock(ObjectCacheMutex);
-  ObjectRefCounter[Filename]--;
-  if (ObjectRefCounter[Filename] == 0)
+  if (--ObjectRefCounter[Filename] == 0)
     ObjectCache.erase(Filename);
 }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/127449