[Nios2] final infrastructure to provide compilation of a return from a function

[Nios2] final infrastructure to provide compilation of a return from a function

This patch includes all missing functionality needed to provide first
compilation of a simple program that just returns from a function.
I've added a test case that checks for "ret" instruction printed in assembly
output.

Patch by Andrei Grischenko (andrei.l.grischenko@intel.com)
Differential revision: https://reviews.llvm.org/D39688

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320035 91177308-0d34-0410-b5e6-96231b3b80d8