Fixes #3752

In my testing, for a method returning byte[], Method#getGenericReturnType() on a normal JVM returns a Class, the same as byte[].class.

On Android, the implementation is completely different than OpenJDK's. Code ref:
https://cs.android.com/android/platform/superproject/main/+/main:libcore/ojluni/src/main/java/java/lang/reflect/Method.java;l=175-177;bpv=0;bpt=1

It uses Android-specific reflection APIs under the hood, and this returns a GenericArrayType with component type byte.class.

This is my attempt to handle this scenario, by adding primitive support to GenericArrayReturnType.

Checklist

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