[PATCH][AVX512] Enable intrinsics for vpcmpeq

[Robert Khasanov]

Hi Elena, Adam,

In these patches I enable intrinsics for vpcmpeq{bwdq} instructions.
Since result of the instructions is mask, I enable new intrinsics type
CMP_MASK and assume to enable CMP_MASK_CC in future for vpcmp{bwdq}
instructions (due to additional CC argument).
Also I extended argument types when intrinsics generated through TableGen
(IIT_V64) to support 64 packed data.
In last patch I enabled INSERT_SUBVECTOR for v8i1 to legalizer to support
converting v2i1 and v4i1 to v8i1 and then bitcasting to i8.

Please let me know if it looks good.

Robert
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