core/vm: Cleanups & SUB output fix. Closes #1096
core/vm: Cleanups & SUB output fix. Closes #1096

maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum