Disable by register optimizations by default

This change makes the calculator look right again.  Will track
down the problem in local tree.

Change-Id: Id6603af7d0924ec0620631e5c0178750fafb6dd3
diff --git a/src/compiler/Frontend.cc b/src/compiler/Frontend.cc
index f8f985d..d4f1b27 100644
--- a/src/compiler/Frontend.cc
+++ b/src/compiler/Frontend.cc
@@ -27,8 +27,8 @@
      //(1 << kLoadHoisting) |
      //(1 << kSuppressLoads) |
      //(1 << kNullCheckElimination) |
-     //(1 << kPromoteRegs) |
-     //(1 << kTrackLiveTemps) |
+     (1 << kPromoteRegs) |
+     (1 << kTrackLiveTemps) |
      0;
 
 uint32_t compilerDebugFlags = 0 |     // Enable debug/testing modes