alpha fp suffix cleanup

[Richard Henderson]

This was prompted by the T3 patch we saw recently, wherein it
appeared that the Cray assembler would accept "cvttq/c" but
not "cvttqc".  And, I assume from the way the "su" and "sui"
suffixes had been brutally disabled, would accept "addt/su"
but not "addtsu".  As far as I know, gas and dec assemblers
have always accepted either form.

And, now that it's done, seems much cleaner, in that one can
actually see what's going on with the trap suffix mess as 
opposed to the, um, overabundance of %<linenoise>.

Bootstrapped on alphaev6-linux.


r~


        * config/alpha/alpha.c (get_trap_mode_suffix): New.
        (get_round_mode_suffix): New.
        (print_operand): Use them for [/].  Remove support for [&'`()+].
        * config/alpha/alpha.h (PRINT_OPERAND_PUNCT_VALID_P): Update.
        * config/alpha/alpha.md (attr round_suffix): New.
        (attr trap_suffix): New.
        (all insns): Set them appropriately.  Use %/ instead of the
        myriad punctuators.
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