llc using the host cpu features and *waning* on unknown features is probably not a good thing :-( git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189144 91177308-0d34-0410-b5e6-96231b3b80d8
Constant idx case is still done in tablegen but other cases are then expanded Fixes <rdar://problem/10435460> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144557 91177308-0d34-0410-b5e6-96231b3b80d8