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[PowerPC][AIX] Enable passing byval formal arguments in multiple registers.

Authored by sfertile on Mar 24 2020, 10:17 AM.

Description

[PowerPC][AIX] Enable passing byval formal arguments in multiple registers.

Any or all the argument registers can be used to pass a byval formal
argument, with the limitation that the argument must fit in the
available registers (ie: is not split between registers and stack).

Differential Revision: https://reviews.llvm.org/D76902