[cfe-dev] [PATCH] Remove `requires` for x86 CPU features.

[Sean Silva]

As discussed in `Interaction of target attribute change with modules`:

Ever since the target attributes change, we don't need to guard these
headers with `requires`. Actually it's a bit worse, because if we do then
they are included textually under the covers, causing declarations to
appear in submodules they aren't supposed to be in.

Since it seems like only the x86 headers have been given the target
attributes treatment, I've only removed those `requires`.

John, Paul, this affects our modules stuff internally, so CC'ing you guys.
Since we don't ship all the headers, we will need to prune out of the
module map any of the x86 headers that we don't ship, otherwise our
packaged toolchain will encounter "header not found" errors when building
the module.


-- Sean Silva
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