Hello,

this patch prepares for x64 SEH, that frame-pointer points at end of
stack-prologue. This is required for x64, because the SEH unwind
information can't express negative offsets for stack.

ChangeLog

2010-07-04  Kai Tietz

        * config/i386/i386.c (ix86_compute_frame_layout): Let frame's
        hard_frame_pointer_offset point to end of prologue.
        (ix86_expand_prologue): Handle x64 frame-pointer prologue.
        (ix86_expand_epilogue): Handle x64 frame-pointer epilogue.

Tested for i686-pc-cygwin, x86_64-pc-mingw32. Ok for apply?

Regards,
Kai

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