Revert "Disable load/store elimination. DO NOT MERGE"

This reverts commit dfa7a6c8711623bf20aad58f57ae980b497ef4d7.
diff --git a/compiler/dex/frontend.cc b/compiler/dex/frontend.cc
index f7fe41f..e93827d 100644
--- a/compiler/dex/frontend.cc
+++ b/compiler/dex/frontend.cc
@@ -35,7 +35,7 @@
 
 /* Default optimizer/debug setting for the compiler. */
 static uint32_t kCompilerOptimizerDisableFlags = 0 |  // Disable specific optimizations
-  (1 << kLoadStoreElimination) |
+  // (1 << kLoadStoreElimination) |
   // (1 << kLoadHoisting) |
   // (1 << kSuppressLoads) |
   // (1 << kNullCheckElimination) |