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User's guide: update docs for X86 CPU flags

sheaf requested to merge wip/x86-flags-user-guide into master

This MR updates the section of the user's guide pertaining to X86 feature flags with the following changes:

  • the NCG backend now supports SIMD, so remove all text that says the contrary,
  • the LLVM backend does not "automatically detect" features. I don't know where this came from, but it's wrong in general. For example, you will get different assembly whether you pass -mavx to GHC or not when using the LLVM backend.

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