[clang] [clang][LifetimeSafety] Fix unnamed TimeTraceScope in computePersistentOrigins (PR #213521)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-analysis

Author: Gábor Horváth (Xazax-hun)

<details>
<summary>Changes</summary>

The TimeTraceScope was constructed as a temporary and destroyed immediately, so the prepass was reported as taking ~0. It actually accounts for ~14% of LoanPropagation in some cases. 

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Full diff: https://github.com/llvm/llvm-project/pull/213521.diff


1 Files Affected:

- (modified) clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp b/clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp
index 078892bd48c10..12b88c18b90b4 100644
--- a/clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp
+++ b/clang/lib/Analysis/LifetimeSafety/LoanPropagation.cpp
@@ -29,7 +29,7 @@ namespace clang::lifetimes::internal {
 // referenced in more than one basic block.
 static llvm::BitVector computePersistentOrigins(const FactManager &FactMgr,
                                                 const CFG &C) {
-  llvm::TimeTraceScope("ComputePersistentOrigins");
+  llvm::TimeTraceScope TimeProfile("ComputePersistentOrigins");
   unsigned NumOrigins = FactMgr.getOriginMgr().getNumOrigins();
   llvm::BitVector PersistentOrigins(NumOrigins);
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/213521