Move mirror::ArtMethod to native

Optimizing + quick tests are passing, devices boot.

TODO: Test and fix bugs in mips64.

Saves 16 bytes per most ArtMethod, 7.5MB reduction in system PSS.
Some of the savings are from removal of virtual methods and direct
methods object arrays.

Bug: 19264997
Change-Id: I622469a0cfa0e7082a2119f3d6a9491eb61e3f3d
diff --git a/runtime/jit/jit.h b/runtime/jit/jit.h
index 8f92453..dbd8977 100644
--- a/runtime/jit/jit.h
+++ b/runtime/jit/jit.h
@@ -30,13 +30,10 @@
 
 namespace art {
 
+class ArtMethod;
 class CompilerCallbacks;
 struct RuntimeArgumentMap;
 
-namespace mirror {
-class ArtMethod;
-}  // namespace mirror
-
 namespace jit {
 
 class JitCodeCache;
@@ -50,7 +47,7 @@
 
   virtual ~Jit();
   static Jit* Create(JitOptions* options, std::string* error_msg);
-  bool CompileMethod(mirror::ArtMethod* method, Thread* self)
+  bool CompileMethod(ArtMethod* method, Thread* self)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
   void CreateInstrumentationCache(size_t compile_threshold);
   void CreateThreadPool();
@@ -79,7 +76,7 @@
   void* jit_compiler_handle_;
   void* (*jit_load_)(CompilerCallbacks**);
   void (*jit_unload_)(void*);
-  bool (*jit_compile_method_)(void*, mirror::ArtMethod*, Thread*);
+  bool (*jit_compile_method_)(void*, ArtMethod*, Thread*);
 
   // Performance monitoring.
   bool dump_info_on_shutdown_;