This patch adds ABI support for v1i128 data type.

This patch adds ABI support for v1i128 data type.
It adds v1i128 to the appropriate register classes and checks parameter passing
and return values.

This is related to http://reviews.llvm.org/D9081, which will add instructions
that exploit the v1i128 datatype.

Phabricator review: http://reviews.llvm.org/D9475

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236503 91177308-0d34-0410-b5e6-96231b3b80d8