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[AIX] Add call lowering for parameters that could pass onto FPRs

Authored by jasonliu on Aug 14 2019, 7:13 AM.

Description

[AIX] Add call lowering for parameters that could pass onto FPRs

Summary:
This patch adds call lowering functionality to enable passing
parameters onto floating point registers when needed.

Differential Revision: https://reviews.llvm.org/D63654

llvm-svn: 368855