[llvm] [llvm-jitlink] Avoid repeated hash lookups (NFC) (PR #128399)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/128399

None

>From d0dc8f3cc6265ea52d0b6429e4aad93c89dbb28d Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sat, 22 Feb 2025 02:31:00 -0800
Subject: [PATCH] [llvm-jitlink] Avoid repeated hash lookups (NFC)

---
 llvm/tools/llvm-jitlink/llvm-jitlink-coff.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/tools/llvm-jitlink/llvm-jitlink-coff.cpp b/llvm/tools/llvm-jitlink/llvm-jitlink-coff.cpp
index 6db78926101fd..07d9406cacc52 100644
--- a/llvm/tools/llvm-jitlink/llvm-jitlink-coff.cpp
+++ b/llvm/tools/llvm-jitlink/llvm-jitlink-coff.cpp
@@ -69,14 +69,15 @@ Error registerCOFFGraphInfo(Session &S, LinkGraph &G) {
   std::lock_guard<std::mutex> Lock(S.M);
 
   auto FileName = sys::path::filename(G.getName());
-  if (S.FileInfos.count(FileName)) {
+  auto [It, Inserted] = S.FileInfos.try_emplace(FileName);
+  if (!Inserted) {
     return make_error<StringError>("When -check is passed, file names must be "
                                    "distinct (duplicate: \"" +
                                        FileName + "\")",
                                    inconvertibleErrorCode());
   }
 
-  auto &FileInfo = S.FileInfos[FileName];
+  auto &FileInfo = It->second;
   LLVM_DEBUG(
       { dbgs() << "Registering COFF file info for \"" << FileName << "\"\n"; });
   for (auto &Sec : G.sections()) {