c/9185: gcc produces errornous code on cygwin host when -fomit-frame-pointer is used together with -O2 or -O3

[Danny Smith]

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=g
cc&pr=9185

I think this may be related  to PR8750 and (IMO, erroneously) closed
PR6810.
Could you try the patch to i386.c (ix86_expand_prologue ) that is in the
8750 audit trail.  It may not be correct patch but at least it seems to
fix 8750 and *this PR on mingw32

Danny