x86: relax mask register constraints
While their use for masking is indeed restricted to %k1...%k7, use as "normal" insn operands also permits %k0. Remove the unnecessary limitations, requiring quite a few testsuite adjustments. Oddly enough some AVX512{F,DQ} test cases already check for %k[0-7], while others did permit {%k0} - where they get touched here anyway this gets fixed at the same time. From-SVN: r267570
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