Add AbstractMethod, Constructor, Method

Moves functionality to ART from libcore. Precursor to moving
ArtMethods to native. Mostly performance improvements.

N5 perf before (irrelevant results removed):
            Class_getConstructor  962.87 ===========
         Class_getDeclaredMethod 2394.37 ============================
                 Class_getMethod 2509.20 ==============================
               Class_newInstance 1999.81 =======================
                  Method_invokeI 1439.02 =================
          Method_invokePreBoxedI 1415.82 ================
            Method_invokeStaticI 1456.24 =================
    Method_invokeStaticPreBoxedI 1427.32 =================
            Method_invokeStaticV  814.47 =========
                  Method_invokeV  816.56 =========
After:
                       benchmark      ns linear runtime
            Class_getConstructor 1302.04 ================
         Class_getDeclaredMethod 1459.01 ==================
                 Class_getMethod 1560.40 ===================
               Class_newInstance 2029.94 =========================
                  Method_invokeI 1312.89 ================
          Method_invokePreBoxedI 1255.01 ===============
            Method_invokeStaticI 1289.13 ===============
    Method_invokeStaticPreBoxedI 1196.52 ==============
            Method_invokeStaticV  790.82 =========
                  Method_invokeV  791.73 =========

Performance improvements are more than just fixing regressions introduced
in: http://android-review.googlesource.com/#/c/146069/

Bug: 19264997

Change-Id: Ife79c469fdb09f30e3aefcfc3e0ce5ed32303fce
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index 7bebb96..2fc8d20 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -77,6 +77,7 @@
 #include "mirror/class-inl.h"
 #include "mirror/class_loader.h"
 #include "mirror/field.h"
+#include "mirror/method.h"
 #include "mirror/stack_trace_element.h"
 #include "mirror/throwable.h"
 #include "monitor.h"
@@ -1308,7 +1309,9 @@
   // need to be visited once per GC since they never change.
   mirror::ArtMethod::VisitRoots(visitor);
   mirror::Class::VisitRoots(visitor);
+  mirror::Constructor::VisitRoots(visitor);
   mirror::Reference::VisitRoots(visitor);
+  mirror::Method::VisitRoots(visitor);
   mirror::StackTraceElement::VisitRoots(visitor);
   mirror::String::VisitRoots(visitor);
   mirror::Throwable::VisitRoots(visitor);