[llvm] [DWARFLinker] Avoid repeated hash lookups (NFC) (PR #110377)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/110377

None

>From 8440b5699657cc2da3cfe36f5b974e398d534597 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Fri, 27 Sep 2024 08:31:20 -0700
Subject: [PATCH] [DWARFLinker] Avoid repeated hash lookups (NFC)

---
 .../llvm/DWARFLinker/Classic/DWARFLinkerDeclContext.h     | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/llvm/include/llvm/DWARFLinker/Classic/DWARFLinkerDeclContext.h b/llvm/include/llvm/DWARFLinker/Classic/DWARFLinkerDeclContext.h
index b00f68c3be84e1..9fb1b3f80e2ffa 100644
--- a/llvm/include/llvm/DWARFLinker/Classic/DWARFLinkerDeclContext.h
+++ b/llvm/include/llvm/DWARFLinker/Classic/DWARFLinkerDeclContext.h
@@ -42,15 +42,15 @@ class CachedPathResolver {
 
     // If the ParentPath has not yet been resolved, resolve and cache it for
     // future look-ups.
-    if (!ResolvedPaths.count(ParentPath)) {
+    auto [It, Inserted] = ResolvedPaths.try_emplace(ParentPath);
+    if (Inserted) {
       SmallString<256> RealPath;
       sys::fs::real_path(ParentPath, RealPath);
-      ResolvedPaths.insert(
-          {ParentPath, std::string(RealPath.c_str(), RealPath.size())});
+      It->second = std::string(RealPath);
     }
 
     // Join the file name again with the resolved path.
-    SmallString<256> ResolvedPath(ResolvedPaths[ParentPath]);
+    SmallString<256> ResolvedPath(It->second);
     sys::path::append(ResolvedPath, FileName);
     return StringPool.internString(ResolvedPath);
   }