[AST] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-clang

Author: Kazu Hirata (kazutakahirata)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/123285.diff

1 Files Affected:

• (modified) clang/lib/AST/VTableBuilder.cpp (+2-2)

diff --git a/clang/lib/AST/VTableBuilder.cpp b/clang/lib/AST/VTableBuilder.cpp
index e941c3bedb0a7e..fa3055dd1206f4 100644
--- a/clang/lib/AST/VTableBuilder.cpp
+++ b/clang/lib/AST/VTableBuilder.cpp
@@ -3831,8 +3831,8 @@ const VirtualBaseInfo &MicrosoftVTableContext::computeVBTableRelatedInformation(
   unsigned VBTableIndex = 1 + VBI->VBTableIndices.size();
   for (const auto &VB : RD->vbases()) {
     const CXXRecordDecl *CurVBase = VB.getType()->getAsCXXRecordDecl();
-    if (!VBI->VBTableIndices.count(CurVBase))
-      VBI->VBTableIndices[CurVBase] = VBTableIndex++;
+    if (VBI->VBTableIndices.try_emplace(CurVBase, VBTableIndex).second)
+      ++VBTableIndex;
   }
 
   return *VBI;