[Bug target/53283] [4.8 Regression] Many failures on x86_64-apple-darwin10 after revision 186789

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53283

--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> 2012-05-19 16:51:27 UTC ---
Created attachment 27441
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27441
fix (bootstrapped *darwin9,10, lightly tested).

.. well Darwin was already using TARGET_FOLD_BUILTIN which has now been
over-ridden in i386.c, leading to the breakage of CFString.

FWIW: since darwin has several targets - we try to keep common stuff in
config/darwin* .. so it's always worth a quick check there, as well as in
config/{i386,rs6000}/

The attached patch bootstrapped on *86*-darwin9/10, ppc-darwin9 - lightly
tested ...  needs checking on Darwin11.