[llvm] [MemProf] Don't skip direct recursion in function summary (PR #78264)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-analysis

Author: None (lifengxiang1025)

<details>
<summary>Changes</summary>

I met one assert in `MemProfContextDisambiguation::applyImport` because metadata doesn't match summary. The reason is function summary skip direct recursion but metadata donen't.

---
Full diff: https://github.com/llvm/llvm-project/pull/78264.diff


1 Files Affected:

- (modified) llvm/lib/Analysis/ModuleSummaryAnalysis.cpp (+1-5) 


``````````diff
diff --git a/llvm/lib/Analysis/ModuleSummaryAnalysis.cpp b/llvm/lib/Analysis/ModuleSummaryAnalysis.cpp
index 1f15e94783240a..7e09192c5f1d51 100644
--- a/llvm/lib/Analysis/ModuleSummaryAnalysis.cpp
+++ b/llvm/lib/Analysis/ModuleSummaryAnalysis.cpp
@@ -499,11 +499,7 @@ static void computeFunctionSummary(
                    StackContext.beginAfterSharedPrefix(InstCallsite);
                ContextIter != StackContext.end(); ++ContextIter) {
             unsigned StackIdIdx = Index.addOrGetStackIdIndex(*ContextIter);
-            // If this is a direct recursion, simply skip the duplicate
-            // entries. If this is mutual recursion, handling is left to
-            // the LTO link analysis client.
-            if (StackIdIndices.empty() || StackIdIndices.back() != StackIdIdx)
-              StackIdIndices.push_back(StackIdIdx);
+            StackIdIndices.push_back(StackIdIdx);
           }
           MIBs.push_back(
               MIBInfo(getMIBAllocType(MIBMD), std::move(StackIdIndices)));

``````````

</details>


https://github.com/llvm/llvm-project/pull/78264