[LoopUtils] Simplify expanded RT-checks (#157518)

Follow up on 528b13d ([SCEVExp] Add helper to clean up dead instructions
after expansion.) to hoist the SCEVExapnder::eraseDeadInstructions call
from LoopVectorize into the LoopUtils APIs add[Diff]RuntimeChecks, so
that other callers (LoopDistribute and LoopVersioning) can benefit from
the patch.

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Utils/LoopUtils.cpp b/llvm/lib/Transforms/Utils/LoopUtils.cpp
index 843364e..b172ef6 100644
--- a/llvm/lib/Transforms/Utils/LoopUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUtils.cpp
@@ -2032,6 +2032,7 @@ Value *llvm::addRuntimeChecks(
     MemoryRuntimeCheck = IsConflict;
   }
 
+  Exp.eraseDeadInstructions(MemoryRuntimeCheck);
   return MemoryRuntimeCheck;
 }
 
@@ -2077,6 +2078,7 @@ Value *llvm::addDiffRuntimeChecks(
     MemoryRuntimeCheck = IsConflict;
   }
 
+  Expander.eraseDeadInstructions(MemoryRuntimeCheck);
   return MemoryRuntimeCheck;
 }