Fix compiler warnings for missing switch cases in lldb.

Summary:
There have been a few new values added to a few LLVM enums
this change makes sure that LLDB code handles them correctly.

Reviewers: labath

Reviewed By: labath

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D30005
Author: Eugene Zemtsov <ezemtsov@google.com>

llvm-svn: 295445