Compiler: Spring cleaning

Significant restructuring of the Quick compiler to break out the
common frontend more cleanly.  Additional C++'ification.

The goal is to move from the monolithic structure of the old
JIT towards a more modular model in which components - in
particular the compiler backend - can be replaced.  This CL
focuses on moving MIR-related data from the CompilationUnit
struct into a new MIRGraph class.  The next CL will isolate all
LIR-related data and code down into the Quick backend.

This change will happen in multiple steps, and may look uglier
before it starts looking better.

Among the changes:

   o Moved all mir-related fields from CompilationUnit to new
     MirGraph class.

   o Moved the register promotion stuff into the Quick backend.

   o Deleted the GBC to LIR conversion code.

   o Replaced with old C-style function pointer dataflow analysis
     dispatcher with a basic block iterator class.

   o Renamed some files to make the name more consistent with what
     the code actually does.

   o Added the foundation for future inlining support.

   o Stripped out the remains of the old fingerprinting mechanism.

Change-Id: I6c30facc642f8084b1c7b2075cf7014de387aa56
diff --git a/src/compiler/dex/quick/gen_invoke.cc b/src/compiler/dex/quick/gen_invoke.cc
index 1ae29be..c654143 100644
--- a/src/compiler/dex/quick/gen_invoke.cc
+++ b/src/compiler/dex/quick/gen_invoke.cc
@@ -1336,18 +1336,14 @@
   // Explicit register usage
   LockCallTemps(cu);
 
-  DexCompilationUnit m_unit(cu);
-
   uint32_t dex_method_idx = info->index;
   int vtable_idx;
   uintptr_t direct_code;
   uintptr_t direct_method;
   bool skip_this;
-  bool fast_path =
-    cu->compiler_driver->ComputeInvokeInfo(dex_method_idx, &m_unit, info->type,
-                                           vtable_idx, direct_code,
-                                           direct_method)
-    && !SLOW_INVOKE_PATH;
+  bool fast_path = cu->compiler_driver->ComputeInvokeInfo(
+      dex_method_idx, cu->mir_graph->GetCurrentDexCompilationUnit(), info->type, vtable_idx,
+      direct_code, direct_method) && !SLOW_INVOKE_PATH;
   if (info->type == kInterface) {
     if (fast_path) {
       p_null_ck = &null_ck;
@@ -1450,7 +1446,7 @@
                                   bool is_range)
 {
   CallInfo* info = static_cast<CallInfo*>(NewMem(cu, sizeof(CallInfo), true, kAllocMisc));
-  MIR* move_result_mir = FindMoveResult(cu, bb, mir);
+  MIR* move_result_mir = cu->mir_graph->FindMoveResult(bb, mir);
   if (move_result_mir == NULL) {
     info->result.location = kLocInvalid;
   } else {