[PATCH] Complex arithmetic changes

[Janne Blomqvist]

Hello,

the attached patch fixes PR:s c/35162 (just a documentation fix) and
fortran/29549.

c/35162 is just a small documentation fix where the documentation was
inconsistent with the code as well as C99.

It adds a new option -fcx-fortran-rules which sets flag_complex_method
to 1, and makes libgfortran use that switch, gaining a factor of 4
speedup on complex matrix multplication.

Regtested on i686-pc-linux-gnu, doc changes tested with 'make info' and
'make pdf'. Ok for trunk?

-- 
Janne Blomqvist
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