[PATCH][RFC] Add support of RDSEED in AVX2

[Michael Liao]

Hi,

The attached patches add RDSEED support. RDSEED is quite similar to
RDRAND except it read a NIST SP800-90B & C compliant random value. So,
the patch '0002-Add-RDSEED-support.patch' adds these insns following the
same approach of RDRAND.
'0001-Enhance-boolean-simplification-to-handle-16-64-bit-R.patch'
enhances previous boolean simplification logic to handle the case where
the boolean value is truncated/zero-extended from a zero value generated
by RDRAND.

Thanks for review
- Michael

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