Rewrite computeMaxLocalsMaxStack, make it more efficient

[retronym]

Before running an ASM Analyzer, the maxLocals and maxStack values of the MethodNode need to be computed (the analyzer pre-allocates frame values).

ASM computes these values while serializing the method, so we currently run a ClassWriter on the method, which is inefficient.

http://mail-archive.ow2.org/asm/2014-10/msg00004.html

Instead we should write a custom visitor that computes the max values.