Always set the mode.

This matches GNU ar behavior. Also remove the now unused getFileStatus method.
Not sure how to add a test, it would have to run ls -l or something like that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184337 91177308-0d34-0410-b5e6-96231b3b80d8
Add unit test to test a trivial verifier check.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184338 91177308-0d34-0410-b5e6-96231b3b80d8
LSR: Fix the parameters used to compute the scaling factor cost.

Prior to this change, the considered addressing modes may be invalid since the
maximum and minimum offsets were not taking into account.
This was causing an assertion failure.

The added test case exercices that behavior.

<rdar://problem/14199725> Assertion failed: (CurScaleCost >= 0 && "Legal
addressing mode has an illegal cost!")


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184341 91177308-0d34-0410-b5e6-96231b3b80d8