From cc140fc716a8363f6dcd4a0a25b15e46fc78955d Mon Sep 17 00:00:00 2001
From: SingleAccretion <62474226+SingleAccretion@users.noreply.github.com>
Date: Mon, 24 Oct 2022 21:30:45 +0300
Subject: [PATCH] Update def flags in gtCloneExpr (#77378)

Limit to cases where are actually performing replacements to mitigate TP impact.
---
 src/coreclr/jit/gentree.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/coreclr/jit/gentree.cpp b/src/coreclr/jit/gentree.cpp
index a513dc7eeeca8..32aa1633c84ee 100644
--- a/src/coreclr/jit/gentree.cpp
+++ b/src/coreclr/jit/gentree.cpp
@@ -8777,6 +8777,10 @@ GenTree* Compiler::gtCloneExpr(
         // Update side effect flags since they may be different from the source side effect flags.
         // For example, we may have replaced some locals with constants and made indirections non-throwing.
         gtUpdateNodeSideEffects(copy);
+        if ((varNum != BAD_VAR_NUM) && copy->OperIsSsaDef())
+        {
+            fgAssignSetVarDef(copy);
+        }
     }
 
     /* GTF_COLON_COND should be propagated from 'tree' to 'copy' */