[ISEL][ARM][AARCH64] Tracking simple parameter forwarding registers

Support for tracking registers that forward function parameters into the
following function frame. For now we only support cases when parameter
is forwarded through single register.

Reviewers: aprantl, vsk, t.p.northover

Reviewed By: vsk

Differential Revision: https://reviews.llvm.org/D66953

llvm-svn: 374033