Refactor HGraphBuilder and SsaBuilder to remove HLocals

This patch merges the instruction-building phases from HGraphBuilder
and SsaBuilder into a single HInstructionBuilder class. As a result,
it is not necessary to generate HLocal, HLoadLocal and HStoreLocal
instructions any more, as the builder produces SSA form directly.

Saves 5-15% of arena-allocated memory (see bug for more data):
  GMS      20.46MB  =>  19.26MB  (-5.86%)
  Maps     24.12MB  =>  21.47MB  (-10.98%)
  YouTube  28.60MB  =>  26.01MB  (-9.05%)

Bug: 27894376
Change-Id: Iefe28d40600c169c5d306fd2c77034ae19476d90

1 files changed, 0 insertions, 3 deletions

diff --git a/compiler/optimizing/code_generator.h b/compiler/optimizing/code_generator.h
index cad55296bc..1a060b1f58 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -211,7 +211,6 @@ class CodeGenerator {
                                 size_t maximum_number_of_live_fpu_registers,
                                 size_t number_of_out_slots,
                                 const ArenaVector<HBasicBlock*>& block_order);
-  int32_t GetStackSlot(HLocal* local) const;
 
   uint32_t GetFrameSize() const { return frame_size_; }
   void SetFrameSize(uint32_t size) { frame_size_ = size; }
@@ -525,8 +524,6 @@ class CodeGenerator {
     slow_paths_.reserve(8);
   }
 
-  virtual Location GetStackLocation(HLoadLocal* load) const = 0;
-
   virtual HGraphVisitor* GetLocationBuilder() = 0;
   virtual HGraphVisitor* GetInstructionVisitor() = 0;