Add a parent environment to HEnvironment.

This code has no functionality change. It adds a placeholder
for chaining inlined frames.

Change-Id: I5ec57335af76ee406052345b947aad98a6a4423a
diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index 05451bc..e993d77 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -512,7 +512,7 @@
 
   ArenaAllocator arena(Runtime::Current()->GetArenaPool());
   HGraph* graph = new (&arena) HGraph(
-      &arena, compiler_driver->GetCompilerOptions().GetDebuggable());
+      &arena, dex_file, method_idx, compiler_driver->GetCompilerOptions().GetDebuggable());
 
   // For testing purposes, we put a special marker on method names that should be compiled
   // with this compiler. This makes sure we're not regressing.