[clang] [Driver] Avoid repeated map lookups (NFC) (PR #122625)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clang-driver

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/122625.diff


1 Files Affected:

- (modified) clang/lib/Driver/Driver.cpp (+2-2) 


``````````diff
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 4d9492ea08f647..10df730744b089 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -2534,8 +2534,8 @@ enum {
 static unsigned PrintActions1(const Compilation &C, Action *A,
                               std::map<Action *, unsigned> &Ids,
                               Twine Indent = {}, int Kind = TopLevelAction) {
-  if (Ids.count(A)) // A was already visited.
-    return Ids[A];
+  if (auto It = Ids.find(A); It != Ids.end()) // A was already visited.
+    return It->second;
 
   std::string str;
   llvm::raw_string_ostream os(str);

``````````

</details>


https://github.com/llvm/llvm-project/pull/122625