Move HandleCache to HGraph.

This avoids passing the `VariableSizedHandleScope*` argument
around and eliminates HGraph::inexact_object_rti_ and its
initialization. The latter shall allow running Optimizing
gtests that do not require type information without creating
a Runtime in future. (To be implemented in a separate CL.)

Test: m test-art-host-gtest
Test: testrunner.py --host --optmizing
Test: aosp_taimen-userdebug boots.
Change-Id: I36fe9bc556c6d610d644c8c14cc74c9985a14d64
diff --git a/compiler/optimizing/builder.h b/compiler/optimizing/builder.h
index 6152740..8b76dd9 100644
--- a/compiler/optimizing/builder.h
+++ b/compiler/optimizing/builder.h
@@ -39,14 +39,12 @@
                 const DexCompilationUnit* outer_compilation_unit,
                 CodeGenerator* code_generator,
                 OptimizingCompilerStats* compiler_stats,
-                ArrayRef<const uint8_t> interpreter_metadata,
-                VariableSizedHandleScope* handles);
+                ArrayRef<const uint8_t> interpreter_metadata);
 
   // Only for unit testing.
   HGraphBuilder(HGraph* graph,
                 const DexCompilationUnit* dex_compilation_unit,
                 const CodeItemDebugInfoAccessor& accessor,
-                VariableSizedHandleScope* handles,
                 DataType::Type return_type = DataType::Type::kInt32);
 
   GraphAnalysisResult BuildGraph();
@@ -72,7 +70,6 @@
 
   OptimizingCompilerStats* const compilation_stats_;
   const ArrayRef<const uint8_t> interpreter_metadata_;
-  VariableSizedHandleScope* const handles_;
   const DataType::Type return_type_;
 
   DISALLOW_COPY_AND_ASSIGN(HGraphBuilder);