[cfe-commits] [PATCH] ARM ABI: handle varargs with vector types.

[Manman Ren]

We used to generate incorrect results when passing vector types as varargs.

This patch is intended to fix the issues:
  For illegal vector types, we legalize them in clang.
  For varargs, make sure the vector is correctly aligned before casting it to the vector type.

Thanks for reviewing.
Manman
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