[llvm] [ExecutionEngine] Avoid repeated hash lookups (NFC) (PR #127577)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/127577

None

>From aef8ab367ba62af4acbd513a0315815c135dc970 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Mon, 17 Feb 2025 02:07:19 -0800
Subject: [PATCH] [ExecutionEngine] Avoid repeated hash lookups (NFC)

---
 llvm/lib/ExecutionEngine/Orc/ELFNixPlatform.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/ExecutionEngine/Orc/ELFNixPlatform.cpp b/llvm/lib/ExecutionEngine/Orc/ELFNixPlatform.cpp
index 7f0a45941cf9b..9ac8c5ef66de6 100644
--- a/llvm/lib/ExecutionEngine/Orc/ELFNixPlatform.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/ELFNixPlatform.cpp
@@ -469,11 +469,12 @@ void ELFNixPlatform::pushInitializersLoop(
       Worklist.pop_back();
 
       // If we've already visited this JITDylib on this iteration then continue.
-      if (JDDepMap.count(DepJD))
+      auto [It, Inserted] = JDDepMap.try_emplace(DepJD);
+      if (!Inserted)
         continue;
 
       // Add dep info.
-      auto &DM = JDDepMap[DepJD];
+      auto &DM = It->second;
       DepJD->withLinkOrderDo([&](const JITDylibSearchOrder &O) {
         for (auto &KV : O) {
           if (KV.first == DepJD)