[4.0] fix PR 21169

[Dinar Temirbulatov]

 This patch is a backport from the mainline that fixes the bug #21169.
Build and tested for i686-pc-linux-gnu and  x86_64-unknown-linux-gnu
 Here is the original patch:

 2005-04-12  Richard Henderson  <rth@redhat.com>

        * config/i386/i386.c (ix86_prepare_sse_fp_compare_args): Split ...
        (ix86_expand_sse_fp_minmax): ... from ...
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