Add stress-test mode for  ResolveMethodFromCode

To force call to artResolveMethodFromCode prior to each virtual or
super invoke, add (1 << kDebugExerciseResolveMethod) bit to the
compiler's debug flags.

Change-Id: If14e4bcc8073c8ac7a7a8d0d92bc49444528f77e
diff --git a/src/compiler/Frontend.cc b/src/compiler/Frontend.cc
index 5855341..2eba586 100644
--- a/src/compiler/Frontend.cc
+++ b/src/compiler/Frontend.cc
@@ -41,6 +41,7 @@
      //(1 << kDebugSlowStringPath) |
      //(1 << kDebugSlowestFieldPath) |
      //(1 << kDebugSlowestStringPath) |
+     //(1 << kDebugExerciseResolveMethod) |
      0;
 
 std::string compilerMethodMatch;      // Method name match to apply above flags