Refactor the Queues test case a little based on feedback from Jim.
Add queues tests for when libBacktraceRecording is absent.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@203864 91177308-0d34-0410-b5e6-96231b3b80d8
Allow a multi-line expression to follow expression commands with options when there is no expression following the option terminating “—“.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@203872 91177308-0d34-0410-b5e6-96231b3b80d8
Fixed crasher when “expr” was NULL due to no characters following the terminating "--".

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@203873 91177308-0d34-0410-b5e6-96231b3b80d8
One more time. Multi-line expressions when there is no valid expression that follow “expr [options] —“.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@203874 91177308-0d34-0410-b5e6-96231b3b80d8