Recommitting r180831 with trivial fix - remember to return errors if you compute.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@180898 91177308-0d34-0410-b5e6-96231b3b80d8
Since the IR interpreter does not (currently)
support operands with vector types, it now reports
that it cannot interpret expressions that use
vector types.  They get sent to the JIT instead.

<rdar://problem/13733651>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@180899 91177308-0d34-0410-b5e6-96231b3b80d8