[Spr 12365] use valueOf() method instead of inefficient new Constructor.

In readAnnotationValue() of ClassReader(org.springframework.asm.ClassReader) ,

there are some inefficient new Byte, Character, Integer constructor.

new Byte((byte) readInt(items[readUnsignedShort(v)])));
->
Byte.valueOf((byte) readInt(items[readUnsignedShort(v)])) );

This will be better for performance.

ISSUE: spr-12365