[PATCH] Teach X86 builtins which target features they require

[Justin Bogner]

This adds the required target feature names to x86 builtins that need
particular features. Most have exactly one ("avx", "aes", etc), but some
of the avx512 features have multiple requirements, eg "avx512vl,avx512bw".

Eric: this should be what you need to implement the warning for using
functions with unsatisfied target requirements for builtins.

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