Stephen Canon 1a9ae47d06 Teach the importer to import any clang vector type as SIMDn<Scalar>. (#23454) ...

* Teach the importer to import any vector type as SIMDN<Scalar>.

Instead of having a known set of vector types, check to see if the
element type conforms to SIMDScalar; if it does, see if we have a
SIMDN defined with the right number of elements. If both are satisfied,
import the vector type as that Swift type.

By making this change, we gain the ability to import vector types
that aren't defined in terms of the Darwin simd module, which lets
us use C API with vector types on other platforms. It also lets us
import *every* vector type that Swift can represent, rather than the
small subset that are currently hardcoded.

* Increased test coverage for increased SIMD types that we can import.

Includes some minor cleanup from review. Also eliminates the old
simd_sans_simd test, since we can now import all of these types even when the simd module isn't imported.

2019-03-22 22:11:22 -04:00

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