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

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[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