[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/LoopVersioning.cpp b/llvm/lib/Transforms/Utils/LoopVersioning.cpp
index 1711163..ec2e6c1 100644
--- a/llvm/lib/Transforms/Utils/LoopVersioning.cpp
+++ b/llvm/lib/Transforms/Utils/LoopVersioning.cpp
@@ -81,6 +81,8 @@ void LoopVersioning::versionLoop(
   } else
     RuntimeCheck = MemRuntimeCheck ? MemRuntimeCheck : SCEVRuntimeCheck;
 
+  Exp.eraseDeadInstructions(SCEVRuntimeCheck);
+
   assert(RuntimeCheck && "called even though we don't need "
                          "any runtime checks");