Refactor reflective method invocation.

Move invocation code out of JNI internal into reflection, including ArgArray
code. Make reflective invocation use the ArgArray to build arguments rather
than allocating a jvalue[] and unboxing arguments into that.
Move reflection part of jni_internal_test into reflection_test.
Make greater use of fast JNI.

Change-Id: Ib381372df5f9a83679e30e7275de24fa0e6b1057
diff --git a/runtime/native/java_lang_Thread.cc b/runtime/native/java_lang_Thread.cc
index 2665a08..de1b593 100644
--- a/runtime/native/java_lang_Thread.cc
+++ b/runtime/native/java_lang_Thread.cc
@@ -38,7 +38,7 @@
 }
 
 static jboolean Thread_isInterrupted(JNIEnv* env, jobject java_thread) {
-  ScopedObjectAccess soa(env);
+  ScopedFastNativeObjectAccess soa(env);
   MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
   Thread* thread = Thread::FromManagedThread(soa, java_thread);
   return (thread != NULL) ? thread->IsInterrupted() : JNI_FALSE;
@@ -170,8 +170,8 @@
 
 static JNINativeMethod gMethods[] = {
   NATIVE_METHOD(Thread, currentThread, "!()Ljava/lang/Thread;"),
-  NATIVE_METHOD(Thread, interrupted, "()Z"),
-  NATIVE_METHOD(Thread, isInterrupted, "()Z"),
+  NATIVE_METHOD(Thread, interrupted, "!()Z"),
+  NATIVE_METHOD(Thread, isInterrupted, "!()Z"),
   NATIVE_METHOD(Thread, nativeCreate, "(Ljava/lang/Thread;JZ)V"),
   NATIVE_METHOD(Thread, nativeGetStatus, "(Z)I"),
   NATIVE_METHOD(Thread, nativeHoldsLock, "(Ljava/lang/Object;)Z"),