reload error in current x86 mainline version

[Alan Modra]

The attached patch fixes the ICE reported in msg00223.html

gcc/ChangeLog
* config/i386/i386.c (split_xf1): New.
* config/i386/i386-protos.h: Declare it.
* config/i386/i386.md: Correct some comment typos.
(movxf_1): Fix attr.  Add G -> r alternative.
(movxf_1+2): New splitter for XF G -> r.

Warning:  Patch generated by someone with minimal understanding of gcc
internals.  Highly likely to be non-optimal, quite likely to be wrong.