[llvm] [MC] Avoid repeated hash lookups (NFC) (PR #123698)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-webassembly

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/123698.diff


1 Files Affected:

- (modified) llvm/lib/MC/WasmObjectWriter.cpp (+3-2) 


``````````diff
diff --git a/llvm/lib/MC/WasmObjectWriter.cpp b/llvm/lib/MC/WasmObjectWriter.cpp
index 8ddbe929e68b94..c5a95cb3da5433 100644
--- a/llvm/lib/MC/WasmObjectWriter.cpp
+++ b/llvm/lib/MC/WasmObjectWriter.cpp
@@ -746,10 +746,11 @@ static void addData(SmallVectorImpl<char> &DataBytes,
 uint32_t
 WasmObjectWriter::getRelocationIndexValue(const WasmRelocationEntry &RelEntry) {
   if (RelEntry.Type == wasm::R_WASM_TYPE_INDEX_LEB) {
-    if (!TypeIndices.count(RelEntry.Symbol))
+    auto It = TypeIndices.find(RelEntry.Symbol);
+    if (It == TypeIndices.end())
       report_fatal_error("symbol not found in type index space: " +
                          RelEntry.Symbol->getName());
-    return TypeIndices[RelEntry.Symbol];
+    return It->second;
   }
 
   return RelEntry.Symbol->getIndex();

``````````

</details>


https://github.com/llvm/llvm-project/pull/123698