Add an implementation of GetMethodID.

Also, add an initialization check to GetStaticMethodID.

Change-Id: I45f3aa3bc335b697cfe7d3308ba36bd9911ebe49
diff --git a/src/object.h b/src/object.h
index 4f32cf9..abcf51f 100644
--- a/src/object.h
+++ b/src/object.h
@@ -868,10 +868,16 @@
     return GetStatus() >= kStatusResolved;
   }
 
+  // Returns true if the class has been loaded.
   bool IsLoaded() const {
     return GetStatus() >= kStatusLoaded;
   }
 
+  // Returns true if the class is initialized.
+  bool IsInitialized() const {
+    return GetStatus() == kStatusInitialized;
+  }
+
   // Returns true if this class is in the same packages as that class.
   bool IsInSamePackage(const Class* that) const;