Don't try to create Expressions when the process is running. #5587
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We generally prohibit this at a higher level - for instance requiring the process to be stopped for "expr". But when we trigger an expression for internal purposes (e.g. to fetch types from the ObjC runtime) we weren't checking the process state. Now we explicitly check this at the very start of the job so we don't get into bad states.
Differential Revision: https://reviews.llvm.org/D137684
(cherry picked from commit b565e7f)