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[Power9][NFC] add back-end tests for passing homogeneous fp128 aggregates by…

Authored by lei on Jul 4 2018, 11:51 PM.

Description

[Power9][NFC] add back-end tests for passing homogeneous fp128 aggregates by value

Tests to verify that we are passing fp128 via VSX registers as per ABI.
These are related to clang commit rL336308.

Differential Revision: https://reviews.llvm.org/D48310

llvm-svn: 336314