Fix all shift/reduce and reduce/reduce conflicts except for those that

Fix all shift/reduce and reduce/reduce conflicts except for those that
involve REG_AL, REG_AX, and REG_EAX with immediates.  Also eliminated
various unused rules.
Still need to figure out the proper thing to do with XCHG and AX/EAX as
one of the parameters.
Build still breaks because ONE is not a real token (it needs to be handled
along with the AL, AX, and EAX conflicts in gen_instr.pl).

svn path=/trunk/yasm/; revision=33