[ARM GlobalISel] Add test for a MOVTi16 pattern. NFC

Add test for matching an OR with 0xFFFF0000 to a MOVTi16.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320362 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed