If you say
(lldb) frame variable
without first launching the inferior, you get:
error: invalid frame

this is misleading and should probably hint that there is no process. Adding this flag makes sure that we get:
error: invalid process

The difference between eFlagRequiresProcess and eFlagProcessMustBeLaunched is an open question.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175702 91177308-0d34-0410-b5e6-96231b3b80d8