[clang] [AST] Avoid repeated hash lookups (NFC) (PR #127299)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/127299.diff


1 Files Affected:

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


``````````diff
diff --git a/clang/lib/AST/VTableBuilder.cpp b/clang/lib/AST/VTableBuilder.cpp
index 19d76df99dbe3..18893b996b5d6 100644
--- a/clang/lib/AST/VTableBuilder.cpp
+++ b/clang/lib/AST/VTableBuilder.cpp
@@ -2115,8 +2115,8 @@ void ItaniumVTableBuilder::dumpLayout(raw_ostream &Out) {
 
     // Dump the next address point.
     uint64_t NextIndex = Index + 1;
-    if (AddressPointsByIndex.count(NextIndex)) {
-      if (AddressPointsByIndex.count(NextIndex) == 1) {
+    if (unsigned Count = AddressPointsByIndex.count(NextIndex)) {
+      if (Count == 1) {
         const BaseSubobject &Base =
           AddressPointsByIndex.find(NextIndex)->second;
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/127299