[PATCH, i386]: Rewrite x87 sqrt patterns, take 2a (macroized)

[Eric Botcazou]

> I'm digging through my brown paper bag collection to find appropriate
> bag, but I _did_ make a full bootstrap & regression test, and there was
> no RTL check message!

Probably because RTL checking was not enabled.  I'm of the opinion that people 
making (non-trivial) changes in the RTL middle-end should configure the 
compiler with --enable-checking=yes,rtl but others seem to disagree.

-- 
Eric Botcazou