[Diffusion] rG825235c140e7: Revert "[Sema] Use the canonical type in function isVector"

[Akira Hatanaka via Phabricator via cfe-commits]

ahatanak added a comment.

I'm still not sure why `__fp16`, which is a storage-only type, is used for the element type of `float16x4_t` if we want to avoid promotion to a float vector type.

https://clang.llvm.org/docs/LanguageExtensions.html#half-precision-floating-point

Was there a discussion on llvm-dev or phabricator?


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https://reviews.llvm.org/rG825235c140e7