[clang-tools-extra] [clang-tidy] Avoid repeated hash lookups (NFC) (PR #127370)

[Kazu Hirata via cfe-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/127370

None

>From 356e99802d0d77be7fad4f9297a605334e08ffbd Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sat, 15 Feb 2025 01:40:13 -0800
Subject: [PATCH] [clang-tidy] Avoid repeated hash lookups (NFC)

---
 .../clang-tidy/bugprone/VirtualNearMissCheck.cpp            | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/clang-tools-extra/clang-tidy/bugprone/VirtualNearMissCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/VirtualNearMissCheck.cpp
index 76fa2d916f0e8..509fce3a38471 100644
--- a/clang-tools-extra/clang-tidy/bugprone/VirtualNearMissCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/VirtualNearMissCheck.cpp
@@ -179,15 +179,15 @@ static bool checkOverrideByDerivedMethod(const CXXMethodDecl *BaseMD,
 
 bool VirtualNearMissCheck::isPossibleToBeOverridden(
     const CXXMethodDecl *BaseMD) {
-  auto Iter = PossibleMap.find(BaseMD);
-  if (Iter != PossibleMap.end())
+  auto [Iter, Inserted] = PossibleMap.try_emplace(BaseMD);
+  if (!Inserted)
     return Iter->second;
 
   bool IsPossible = !BaseMD->isImplicit() && !isa<CXXConstructorDecl>(BaseMD) &&
                     !isa<CXXDestructorDecl>(BaseMD) && BaseMD->isVirtual() &&
                     !BaseMD->isOverloadedOperator() &&
                     !isa<CXXConversionDecl>(BaseMD);
-  PossibleMap[BaseMD] = IsPossible;
+  Iter->second = IsPossible;
   return IsPossible;
 }