[X86] Add AVX512 floating cmpgt and integer comparison builtins. Intrinsic header file usages coming later.
[X86] Add AVX512 floating cmpgt and integer comparison builtins. Intrinsic header file usages coming later.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@227065 91177308-0d34-0410-b5e6-96231b3b80d8

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