Revert "Revert "load store elimination.""

This reverts commit 8030c4100d2586fac39ed4007c61ee91d4ea4f25.

Change-Id: I79558d85484be5f5d04e4a44bea7201fece440f0
diff --git a/runtime/base/arena_allocator.h b/runtime/base/arena_allocator.h
index 4e9282f..7747bdf 100644
--- a/runtime/base/arena_allocator.h
+++ b/runtime/base/arena_allocator.h
@@ -106,6 +106,7 @@
   kArenaAllocCodeGenerator,
   kArenaAllocParallelMoveResolver,
   kArenaAllocGraphChecker,
+  kArenaAllocLSE,
   kNumArenaAllocKinds
 };