[i386] Fix ambiguous .md attribute uses

[i386] Fix ambiguous .md attribute uses

This patch is part of a series that fixes ambiguous attribute
uses in .md files, i.e. cases in which attributes didn't use
<ITER:ATTR> to specify an iterator, and in which <ATTR> could
have different values depending on the iterator chosen.

No behavioural change except for dropping the unused *andnot<mode>3_bcst
permutations.

2019-07-06  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/i386/i386.md (*fop_<X87MODEF:mode>_3_i387)
	(l<rounding_insn><MODEF:mode><SWI48:mode>2): Fix ambiguous uses
	of .md attributes.
	* config/i386/sse.md (*avx512pf_gatherpf<mode>sf_mask)
	(*avx512pf_gatherpf<mode>df_mask, *avx512pf_scatterpf<mode>sf_mask)
	(*avx512pf_scatterpf<mode>df_mask, *avx2_gathersi<mode>)
	(*avx2_gathersi<mode>_2, *avx2_gatherdi<mode>)
	(*avx2_gatherdi<mode>_2, *avx2_gatherdi<mode>_3): Likewise.
	(*avx2_gatherdi<mode>_4, *avx512f_gathersi<mode>): Likewise.
	(*avx512f_gathersi<mode>_2, *avx512f_gatherdi<mode>): Likewise.
	(*avx512f_gatherdi<mode>_2, *avx512f_scattersi<mode>): Likewise.
	(*avx512f_scatterdi<mode>): Likewise.
	(*andnot<mode>3_bcst): Fix VI/VI48_AVX512VL typo.

From-SVN: r273161