[clang] [Format] Avoid repeated hash lookups (NFC) (PR #108794)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-format

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/108794.diff


1 Files Affected:

- (modified) clang/lib/Format/MacroExpander.cpp (+3-2) 


``````````diff
diff --git a/clang/lib/Format/MacroExpander.cpp b/clang/lib/Format/MacroExpander.cpp
index 5768ff37fefcda..fd2a16894d643d 100644
--- a/clang/lib/Format/MacroExpander.cpp
+++ b/clang/lib/Format/MacroExpander.cpp
@@ -191,9 +191,10 @@ MacroExpander::expand(FormatToken *ID,
   auto expandArgument = [&](FormatToken *Tok) -> bool {
     // If the current token references a parameter, expand the corresponding
     // argument.
-    if (Tok->isNot(tok::identifier) || ExpandedArgs.contains(Tok->TokenText))
+    if (Tok->isNot(tok::identifier))
+      return false;
+    if (!ExpandedArgs.insert(Tok->TokenText).second)
       return false;
-    ExpandedArgs.insert(Tok->TokenText);
     auto I = Def.ArgMap.find(Tok->TokenText);
     if (I == Def.ArgMap.end())
       return false;

``````````

</details>


https://github.com/llvm/llvm-project/pull/108794