(output_option{,s}): New functions to write -f, -m, and -W options to the
asm file.
(rs6000_float_const): New function to generate floating point constants
portably used in signed,unsigned -> double conversions.
(rs6000_stack_info,debug_stack_info): Use ABI enumeration instead
of AIX vs. V.4 boolean.

From-SVN: r10317