From 533f6a4ef101b86ff06fe53deda5eb2a17e136a9 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu@google.com>
Date: Mon, 10 Mar 2025 10:21:00 -0700
Subject: [PATCH] [ExecutionEngine] Avoid repeated hash lookups (NFC)

---
 .../lib/ExecutionEngine/Orc/Debugging/DebugInfoSupport.cpp | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/llvm/lib/ExecutionEngine/Orc/Debugging/DebugInfoSupport.cpp b/llvm/lib/ExecutionEngine/Orc/Debugging/DebugInfoSupport.cpp
index 5a058bd712a3e..9b842180fa7a7 100644
--- a/llvm/lib/ExecutionEngine/Orc/Debugging/DebugInfoSupport.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/Debugging/DebugInfoSupport.cpp
@@ -33,10 +33,9 @@ static DenseSet<StringRef> DWARFSectionNames = {
 static void preserveDWARFSection(LinkGraph &G, Section &Sec) {
   DenseMap<Block *, Symbol *> Preserved;
   for (auto Sym : Sec.symbols()) {
-    if (Sym->isLive())
-      Preserved[&Sym->getBlock()] = Sym;
-    else if (!Preserved.count(&Sym->getBlock()))
-      Preserved[&Sym->getBlock()] = Sym;
+    auto [It, Inserted] = Preserved.try_emplace(&Sym->getBlock());
+    if (Inserted || Sym->isLive())
+      It->second = Sym;
   }
   for (auto Block : Sec.blocks()) {
     auto &PSym = Preserved[Block];