Do generic rs_machine_dependent relaxation only if TC_GENERIC_RELAX_TABLE is
defined. Use its value as the base of the table, so the actual declaration
can be cpu-specific (and const or not as appropriate). For other cpus where
this isn't done (the majority), delete md_relax_table altogether.
For machines with WORKING_DOT_WORD, delete md_{short,long}_jump_size.
* config/tc-ppc.c (md_parse_option): Accept mpwr2 as a synonym for
mpwrx; mppc32, m603, and m604 as synonyms for mppc; and mppc64 and
m620 for PowerPC64 mode.
(ppc_symbol_new_hook): Add T0 as synonym for TC0 suffix.
(ppc_arch): Check for PPC_OPCODE_PPC before PPC_OPCODE_POWER.
(md_begin): If an instruction has a size specific flag set, only
add it if we are assembling that size.