[ARM] Testcase for missed optimization for masking.

When the result of masking is truncated to i16, we should try to use
"bic" instead of "and".



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335001 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed