Revert 29fada4

Seeing a test failure with asan in Halide generated code, reverting
while I investigate.

Differential Revision: https://reviews.llvm.org/D121987

Author: alinas

llvm/lib/Transforms/Scalar/EarlyCSE.cpp

@@ -598,7 +598,10 @@ class EarlyCSE {
            const TargetTransformInfo &TTI, DominatorTree &DT,
            AssumptionCache &AC, MemorySSA *MSSA)
       : TLI(TLI), TTI(TTI), DT(DT), AC(AC), SQ(DL, &TLI, &DT, &AC), MSSA(MSSA),
-        MSSAUpdater(std::make_unique<MemorySSAUpdater>(MSSA)) {}
+        MSSAUpdater(std::make_unique<MemorySSAUpdater>(MSSA)) {
+    if (MSSA)
+      MSSA->ensureOptimizedUses();
+  }
 
   bool run();