optimization/10017: [3.2/3.3/3.4 regression] ICE: unable to find a register to spill in class `GENERAL_REGS'

[Janis Johnson]

This is the patch that introduced the regression (yeah, I know,
this information probably isn't the least bit useful):

Wed Sep  1 21:13:48 1999  Richard Henderson  <rth@cygnus.com>

        Merge new ia32 backend from the branch!

        * i386.h, i386.c, i386.md, reg-stack.c, i386/unix.h: Many
changes.
        See ChangeLog.P2 on new_ia32_branch for details.

        * rtl.h (stack_regs_mentioned_p): Delete prototype.
        * i386/cygwin.h (SUBTARGET_PROLOGUE): No more do_rtl.
        * i386/win32.h (SUBTARGET_PROLOGUE): Likewise.
        * i386/gas.h (ASM_FILE_START): Define.
        * i386/winnt.c (i386_pe_valid_decl_attribute_p): Update
        for name change of ix86_valid_decl_attribute_p.
        (i386_pe_valid_type_attribute_p): Similarly.

The hunt used Volker's reduced testcase with -march=i686 on
i686-pc-linux-gnu.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10017