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/CompilerIR.h b/src/compiler/CompilerIR.h
index 8a3fa09..b512c5b 100644
--- a/src/compiler/CompilerIR.h
+++ b/src/compiler/CompilerIR.h
@@ -107,9 +107,9 @@
 #define INVALID_OFFSET (-1)
 
 /* SSA encodings for special registers */
-#define SSA_METHOD_BASEREG (-1)
+#define SSA_METHOD_BASEREG (-2)
 /* First compiler temp basereg, grows smaller */
-#define SSA_CTEMP_BASEREG (-2)
+#define SSA_CTEMP_BASEREG (SSA_METHOD_BASEREG - 1)
 
 /*
  * Some code patterns cause the generation of excessively large