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

[Kazu Hirata via llvm-commits]

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

None

>From f5683b047dc9dd139b8c1e56232ca6ed3b391804 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sun, 16 Feb 2025 08:30:35 -0800
Subject: [PATCH] [dsymutil] Avoid repeated hash lookups (NFC)

---
 llvm/tools/dsymutil/BinaryHolder.cpp | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

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);
 }