[ARM] Add -mfpu=none option to the driver.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191736 91177308-0d34-0410-b5e6-96231b3b80d8
Author a FIXME in a test now that PR12784 is fixed

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191758 91177308-0d34-0410-b5e6-96231b3b80d8
Run the -cxx-abi test in 32-bit mode as the 64-bit one crashes on the bots

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191760 91177308-0d34-0410-b5e6-96231b3b80d8