Register promotion support for 64-bit targets

Not sufficiently tested for 64-bit targets, but should be
fairly close.

A significant amount of refactoring could stil be done, (in
later CLs).

With this change we are not making any changes to the vmap
scheme.  As a result, it is a requirement that if a vreg
is promoted to both a 32-bit view and the low half of a
64-bit view it must share the same physical register.  We
may change this restriction later on to allow for more flexibility
for 32-bit Arm.

For example, if v4, v5, v4/v5 and v5/v6 are all hot enough to
promote, we'd end up with something like:

v4 (as an int)    -> r10
v4/v5 (as a long) -> r10
v5 (as an int)    -> r11
v5/v6 (as a long) -> r11

Fix a couple of ARM64 bugs on the way...

Change-Id: I6a152b9c164d9f1a053622266e165428045362f3
diff --git a/compiler/dex/quick/arm/codegen_arm.h b/compiler/dex/quick/arm/codegen_arm.h
index 70dce7f..a9d5893 100644
--- a/compiler/dex/quick/arm/codegen_arm.h
+++ b/compiler/dex/quick/arm/codegen_arm.h
@@ -67,7 +67,6 @@
     void MarkPreservedSingle(int v_reg, RegStorage reg);
     void MarkPreservedDouble(int v_reg, RegStorage reg);
     void CompilerInitializeRegAlloc();
-    RegStorage AllocPreservedDouble(int s_reg);
 
     // Required for target - miscellaneous.
     void AssembleLIR();
@@ -196,6 +195,8 @@
     bool InexpensiveConstantFloat(int32_t value);
     bool InexpensiveConstantLong(int64_t value);
     bool InexpensiveConstantDouble(int64_t value);
+    RegStorage AllocPreservedDouble(int s_reg);
+    RegStorage AllocPreservedSingle(int s_reg);
 
   private:
     void GenFusedLongCmpImmBranch(BasicBlock* bb, RegLocation rl_src1, int64_t val,