i386: Fix a typo in comments for for "Yd"

i386: Fix a typo in comments for for "Yd"

config/i386/constraints.md has

(define_register_constraint "Yd"
 "TARGET_AVX512DQ ? ALL_SSE_REGS : TARGET_SSE4_1 ? SSE_REGS : NO_REGS"
 "@internal Any EVEX encodable SSE register (@code{%xmm0-%xmm31}) for AVX512DQ target or any SSE register for SSE4_1 target.")

Comments for "Yd" should mention AVX512DQ, not AVX512BW.

	* config/i386/constraints.md (Yd): Replace AVX512BW with AVX512DQ
	in comments

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@268759 138bc75d-0d04-0410-961f-82ee72b054a4