[clang] [Clang][NFC] Introduce no local variable to avoid use after move (PR #139784)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Shafik Yaghmour (shafik)

<details>
<summary>Changes</summary>

Static analysis flagged the use of Left.size() because we just moved out of Left and that would be undefined behavior. Fix is to take the size and store it in a local variable instead.

---
Full diff: https://github.com/llvm/llvm-project/pull/139784.diff


1 Files Affected:

- (modified) clang/lib/Sema/SemaConcept.cpp (+2-1) 


``````````diff
diff --git a/clang/lib/Sema/SemaConcept.cpp b/clang/lib/Sema/SemaConcept.cpp
index 15b9c97489e7f..543bd450c554e 100644
--- a/clang/lib/Sema/SemaConcept.cpp
+++ b/clang/lib/Sema/SemaConcept.cpp
@@ -1999,8 +1999,9 @@ FormulaType SubsumptionChecker::Normalize(const NormalizedConstraint &NC) {
   });
 
   if (NC.getCompoundKind() == FormulaType::Kind) {
+    auto SizeLeft = Left.size();
     Res = std::move(Left);
-    Res.reserve(Left.size() + Right.size());
+    Res.reserve(SizeLeft + Right.size());
     std::for_each(std::make_move_iterator(Right.begin()),
                   std::make_move_iterator(Right.end()), Add);
     return Res;

``````````

</details>


https://github.com/llvm/llvm-project/pull/139784