[llvm] [Utils] Avoid repeated hash lookups (NFC) (PR #115262)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/115262

None

>From 555294c71f6eb4a62552aed3b8ea9d5f301ab3cd Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Wed, 6 Nov 2024 08:46:49 -0800
Subject: [PATCH] [Utils] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Transforms/Utils/Local.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 47a70492559610..768765b6c1e632 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -2178,11 +2178,9 @@ void llvm::insertDebugValuesForPHIs(BasicBlock *BB,
       auto V = DbgValueMap.find(VI);
       if (V != DbgValueMap.end()) {
         auto *DbgII = cast<DbgVariableIntrinsic>(V->second);
-        auto NewDI = NewDbgValueMap.find({Parent, DbgII});
-        if (NewDI == NewDbgValueMap.end()) {
-          auto *NewDbgII = cast<DbgVariableIntrinsic>(DbgII->clone());
-          NewDI = NewDbgValueMap.insert({{Parent, DbgII}, NewDbgII}).first;
-        }
+        auto [NewDI, Inserted] = NewDbgValueMap.try_emplace({Parent, DbgII});
+        if (Inserted)
+          NewDI->second = cast<DbgVariableIntrinsic>(DbgII->clone());
         DbgVariableIntrinsic *NewDbgII = NewDI->second;
         // If PHI contains VI as an operand more than once, we may
         // replaced it in NewDbgII; confirm that it is present.