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, 2 insertions, 2 deletions

diff --git a/compiler/optimizing/optimizing_unit_test.h b/compiler/optimizing/optimizing_unit_test.h
index b140125d14..dd5cb1c9bb 100644
--- a/compiler/optimizing/optimizing_unit_test.h
+++ b/compiler/optimizing/optimizing_unit_test.h
@@ -91,8 +91,8 @@ inline HGraph* CreateCFG(ArenaAllocator* allocator,
   {
     ScopedObjectAccess soa(Thread::Current());
     StackHandleScopeCollection handles(soa.Self());
-    HGraphBuilder builder(graph, *item, return_type);
-    bool graph_built = (builder.BuildGraph(&handles) == kAnalysisSuccess);
+    HGraphBuilder builder(graph, *item, &handles, return_type);
+    bool graph_built = (builder.BuildGraph() == kAnalysisSuccess);
     return graph_built ? graph : nullptr;
   }
 }