Support for promoting Method* and compiler temps

This CL completes the support for allowing compiler-generated
data to be treated as a Dalvik register and become subject to
the normal register promotion and live temp tracking machinery.

Also:
   o Removes some vestigal and useless Method* loads from
     range argument setup.
   o Changes the Method* pseudo vReg number from -1 to -2 to
     avoid a conflict with the 0xffff marker in the register map.
   o Removes some experimental code for CSE at the basic block
     level.

Change-Id: I112a8bbe20f95a8d789f63908c84e5fa167c74ac
diff --git a/src/compiler/Frontend.cc b/src/compiler/Frontend.cc
index d97c20f..71435eb 100644
--- a/src/compiler/Frontend.cc
+++ b/src/compiler/Frontend.cc
@@ -35,6 +35,7 @@
      //(1 << kSkipLargeMethodOptimization) |
      //(1 << kSafeOptimizations) |
      //(1 << kBBOpt) |
+     //(1 << kPromoteCompilerTemps) |
      0;
 
 uint32_t compilerDebugFlags = 0 |     // Enable debug/testing modes