use register iterators that include self to reduce code duplication in CriticalAntiDepBreaker

This patch addresses 2 FIXME comments that I added to CriticalAntiDepBreaker while fixing PR20020.

Initialize an MCSubRegIterator and an MCRegAliasIterator to include the self reg.

Assuming that works as advertised, there should be functional difference with this patch, just less code.

Also, remove the associated asserts - we're setting those values just before, so the asserts don't do anything meaningful.

Differential Revision: http://reviews.llvm.org/D4566



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214973 91177308-0d34-0410-b5e6-96231b3b80d8
[AArch64] Fix OS ABI flag for aarch64-linux-gnu target.

For triple aarch64-linux-gnu we were incorrectly setting IRIX.
For triple aarch64 we are correctly setting SYSV.

Patch by Ana Pazos <apazos@codeaurora.org>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214974 91177308-0d34-0410-b5e6-96231b3b80d8
Add test case omitted in r214974.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214975 91177308-0d34-0410-b5e6-96231b3b80d8