isa_parser: Turn the ISA Parser into a subclass of Grammar. This is to prepare for future cleanup where we allow SCons to create a separate grammar class for each ISA
isa_parser: Turn the ISA Parser into a subclass of Grammar.
This is to prepare for future cleanup where we allow SCons to create a
separate grammar class for each ISA

LingxiaoJIA/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,haowu4682/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,haowu4682/gem5