* config/i386/constraints.md (Y2): Rename from Y.
        (Yi): New constraint. 
        * config/i386/i386.md (movsi_1, movdi_2, pushdf_nointeger,
        pushdf_integer, movdf_nointeger, movdf_integer, zero_extendsidi2_32,
        zero_extendsidi2_rex64, truncxfdf2_mixed): Change Y constraints to Y2.
        (extendsfdf2_mixed, extendsfdf2_sse, truncdfsf_fast_mixed,
        truncdfsf_fast_sse, truncdfsf_mixed, fix_truncdfdi_sse,
        fix_truncdfsi_sse, floatsidf2_mixed, floatsidf2_sse,
        floatdidf2_mixed, floatdidf2_sse, absnegdf2_mixed,
        absnegdf2_sse, sse_setccdf, fop_df_comm_mixed, fop_df_comm_sse,
        fop_df_1_mixed, fop_df_1_sse): Change Y constraints to x.
        * config/i386/mmx.md (mov<MMXMODEI>_internal_rex64,
        mov<MMXMODEI>_internal, movv2sf_internal_rex64, movv2sf_internal,
        vec_extractv2si_1): Change Y constraints to Y2.
        * config/i386/sse.md (vec_setv4sf_0, vec_concatv2df, vec_dupv4si,
        vec_dupv2di, sse2_concatv2si, vec_concatv4si_1, vec_concatv2di):
        Change Y constraints to Y2.
        (sse2_loadld): Change Y constraints to x.

From-SVN: r121660