ART: Add GetMethodModifiers

Support GetMethodModifiers to retrieve the modifiers of a JNI
method.

Extend test 910.

Bug: 31684812
Test: m test-art-host-run-test-910-methods
Change-Id: Ib44df099bc056c557e526d5fa267df48ac2fd86c
diff --git a/runtime/openjdkjvmti/OpenjdkJvmTi.cc b/runtime/openjdkjvmti/OpenjdkJvmTi.cc
index f95ec59..9c3e4fc 100644
--- a/runtime/openjdkjvmti/OpenjdkJvmTi.cc
+++ b/runtime/openjdkjvmti/OpenjdkJvmTi.cc
@@ -654,7 +654,7 @@
   static jvmtiError GetMethodModifiers(jvmtiEnv* env,
                                        jmethodID method,
                                        jint* modifiers_ptr) {
-    return ERR(NOT_IMPLEMENTED);
+    return MethodUtil::GetMethodModifiers(env, method, modifiers_ptr);
   }
 
   static jvmtiError GetMaxLocals(jvmtiEnv* env,