[llvm] [Object] Avoid repeated map lookups (NFC) (PR #110201)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata updated https://github.com/llvm/llvm-project/pull/110201

>From 4990eded690bd42a59a2c216d3af6a2a6ba81bc8 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Thu, 26 Sep 2024 08:15:54 -0700
Subject: [PATCH 1/2] [Object] Avoid repeated map lookups (NFC)

---
 llvm/lib/Object/ArchiveWriter.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/llvm/lib/Object/ArchiveWriter.cpp b/llvm/lib/Object/ArchiveWriter.cpp
index 114045561366d7..c61ba868efe60e 100644
--- a/llvm/lib/Object/ArchiveWriter.cpp
+++ b/llvm/lib/Object/ArchiveWriter.cpp
@@ -754,9 +754,8 @@ static Expected<std::vector<unsigned>> getSymbols(SymbolicFile *Obj,
       raw_string_ostream NameStream(Name);
       if (Error E = S.printName(NameStream))
         return std::move(E);
-      if (Map->find(Name) != Map->end())
+      if (!Map->try_emplace(Name, Index).second)
         continue; // ignore duplicated symbol
-      (*Map)[Name] = Index;
       if (Map == &SymMap->Map) {
         Ret.push_back(SymNames.tell());
         SymNames << Name << '\0';

>From ad86aa329f944f4a8c11447cb590cc2936c193d5 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Fri, 27 Sep 2024 08:02:43 -0700
Subject: [PATCH 2/2] Trigger build