BuiltinsSystemZ.def is extended to include the required processor
features per intrinsic.
New test test/CodeGen/builtins-systemz-error2.c that checks for
expected errors when instrinsics are used with a subtarget that does
not support the required feature (e.g. vector support).
Reviewed by Ulrich Weigand.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@264873 91177308-0d34-0410-b5e6-96231b3b80d8