[MemorySSA] Teach LoopSimplify to preserve MemorySSA.

Summary:
Preserve MemorySSA in LoopSimplify, in the old pass manager, if the analysis is available.
Do not preserve it in the new pass manager.
Update tests.

Subscribers: nemanjai, jlebar, javed.absar, Prazek, kbarton, zzheng, jsji, llvm-commits, george.burgess.iv, chandlerc

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60833

llvm-svn: 360270

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp b/llvm/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
index 64a97f86a21..0e672f1449a 100644
--- a/llvm/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
@@ -1545,7 +1545,7 @@ bool LoopConstrainer::run() {
   // This function canonicalizes the loop into Loop-Simplify and LCSSA forms.
   auto CanonicalizeLoop = [&] (Loop *L, bool IsOriginalLoop) {
     formLCSSARecursively(*L, DT, &LI, &SE);
-    simplifyLoop(L, &DT, &LI, &SE, nullptr, true);
+    simplifyLoop(L, &DT, &LI, &SE, nullptr, nullptr, true);
     // Pre/post loops are slow paths, we do not need to perform any loop
     // optimizations on them.
     if (!IsOriginalLoop)