x86/AVX512: improve generated code for bit-wise negation of vectors of integers

x86/AVX512: improve generated code for bit-wise negation of vectors of integers

NOT on vectors of integers does not require loading a constant vector of
all ones into a register - VPTERNLOG can be used here (and could/should
be further used to carry out other binary and ternary logical operations
which don't have a special purpose instruction).

gcc/
2019-07-22  Jan Beulich  <jbeulich@suse.com>

	* config/i386/sse.md (ternlogsuffix): New.
	(one_cmpl<mode>2): Don't force CONSTM1_RTX into a register when
	AVX512F is in use.
	(<mask_codefor>one_cmpl<mode>2<mask_name>): New.

From-SVN: r273663