Add test case for [Stackmaps][X86TTI] Fix think-o in getIntImmCost calculation (r204738).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205464 91177308-0d34-0410-b5e6-96231b3b80d8
ARM: fixup tests to specify the target more explicitly

This changes the tests that were targeting ARM EABI to explicitly specify the
environment rather than relying on the default.  This breaks with the new
Windows on ARM support when running the tests on Windows where the default
environment is no longer EABI.

Take the opportunity to avoid a pointless redirect (helps when trying to debug
with providing a command line invocation which can be copy and pasted) and
removing a few greps in favour of FileCheck.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205465 91177308-0d34-0410-b5e6-96231b3b80d8
Add comments and test case for [X86TTI] Make constant base pointers for GetElementPtr opaque (r204739).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205468 91177308-0d34-0410-b5e6-96231b3b80d8