* config/i386/xmmintrin.h: Make inclusion of emmintrin.h

    * config/i386/xmmintrin.h: Make inclusion of emmintrin.h
        conditional to __SSE2__.
        (Entries below should have been added to first ChangeLog
        entry for amdfam10 dated 2007-02-05)
        * config/i386/emmintrin.h: Generate #error if __SSE2__ is not
        defined.
        * config/i386/pmmintrin.h: Generate #error if __SSE3__ is not
        defined.
        * config/i386/tmmintrin.h: Generate #error if __SSSE3__ is not
        defined.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@121726 138bc75d-0d04-0410-961f-82ee72b054a4