Move more Class annotations to native.

Art side of this change. There is also a corresponding Libcore change.

Seeing speedup in AnnotatedElementBenchmark.
GetDeclaredClasses	 21.61x
GetDeclaringClass	108.73x
GetEnclosingClass	 87.81x
GetEnclosingConstructor	 23.35x
GetEnclosingMethod	 22.71x
GetModifiers		152.47x
GetSimpleName		106.11x
IsAnonymousClass	 91.28x
IsLocalClass		 51.95x

Change-Id: I2b7f7eb7785fc20671fd7c338ffa9c7048a44a48