[llvm] [llvm-jitlink] Avoid repeated hash lookups (NFC) (PR #129993)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/129993

None

>From b544608acd4b3c97ddd163c3723bb196857cfef4 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Wed, 5 Mar 2025 09:01:59 -0800
Subject: [PATCH] [llvm-jitlink] Avoid repeated hash lookups (NFC)

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

diff --git a/llvm/tools/llvm-jitlink/llvm-jitlink-elf.cpp b/llvm/tools/llvm-jitlink/llvm-jitlink-elf.cpp
index 6aa89413b7230..8bd17ebb6317a 100644
--- a/llvm/tools/llvm-jitlink/llvm-jitlink-elf.cpp
+++ b/llvm/tools/llvm-jitlink/llvm-jitlink-elf.cpp
@@ -104,14 +104,15 @@ Error registerELFGraphInfo(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 ELF file info for \"" << FileName << "\"\n";
   });