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[AIX] Add support for non var_arg extended vector ABI calling convention on AIX

Authored by ZarkoCA on Nov 26 2020, 8:15 AM.

Description

[AIX] Add support for non var_arg extended vector ABI calling convention on AIX

This patch enables passing non variadic vector type parameters on the caller and callee side and vector return on AIX that are passed in vector registers only.

So far, support is enabled for only the AIX extended Altivec ABI Calling convention.

Reviewed By: sfertile, DiggerLin

Differential Revision: https://reviews.llvm.org/D86476