Merging r243485:

Merging r243485:
------------------------------------------------------------------------
r243485 | vkalintiris | 2015-07-28 14:43:31 -0700 (Tue, 28 Jul 2015) | 12 lines

[mips][FastISel] Fix call lowering by bailing out on "fastcc" calls.

Summary:
Currently, we support only the MIPS O32 ABI calling convention for call
lowering. With this change we avoid using the O32 calling convetion for
lowering calls marked as using the fast calling convention.

Reviewers: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11515
------------------------------------------------------------------------

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_37@243647 91177308-0d34-0410-b5e6-96231b3b80d8