[lld] [wasm] Avoid repeated hash lookups (NFC) (PR #122626)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-lld

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/122626.diff


1 Files Affected:

- (modified) lld/wasm/SymbolTable.cpp (+2-2) 


``````````diff
diff --git a/lld/wasm/SymbolTable.cpp b/lld/wasm/SymbolTable.cpp
index f57359083d242f..6309cf35fe5523 100644
--- a/lld/wasm/SymbolTable.cpp
+++ b/lld/wasm/SymbolTable.cpp
@@ -1009,8 +1009,8 @@ void SymbolTable::handleWeakUndefines() {
 }
 
 DefinedFunction *SymbolTable::createUndefinedStub(const WasmSignature &sig) {
-  if (stubFunctions.count(sig))
-    return stubFunctions[sig];
+  if (auto it = stubFunctions.find(sig); it != stubFunctions.end())
+    return it->second;
   LLVM_DEBUG(dbgs() << "createUndefinedStub: " << toString(sig) << "\n");
   auto *sym = reinterpret_cast<DefinedFunction *>(make<SymbolUnion>());
   sym->isUsedInRegularObj = true;

``````````

</details>


https://github.com/llvm/llvm-project/pull/122626