Refactor GetIMTIndex

This allows us to more easily maintain and experiment with
interface method table indexing and hashing.

Change-Id: I719920fae7490dcedcda7c1c36db225c2b8b16df
diff --git a/compiler/optimizing/instruction_builder.cc b/compiler/optimizing/instruction_builder.cc
index f2286e4..1c67bcc 100644
--- a/compiler/optimizing/instruction_builder.cc
+++ b/compiler/optimizing/instruction_builder.cc
@@ -16,6 +16,7 @@
 
 #include "instruction_builder.h"
 
+#include "art_method-inl.h"
 #include "bytecode_utils.h"
 #include "class_linker.h"
 #include "driver/compiler_options.h"
@@ -890,7 +891,7 @@
                                            return_type,
                                            dex_pc,
                                            method_idx,
-                                           resolved_method->GetDexMethodIndex());
+                                           resolved_method->GetImtIndex());
   }
 
   return HandleInvoke(invoke,