[cfe-dev] Allowing checkers to mark symbols as live

[Jordy Rose]

The last bit of infrastructure I'd like to add for CStringChecker: the
ability for checkers to mark symbols live. This lets checkers use conjured
symbols for data that lives in the GDM, rather than in the store. This
doesn't affect EvalDeadSymbols.

I think it's pretty straightforward, but since it's another new callback I
figured it was worth waiting for comments before committing. (When we work
out a general mechanism for checker caching we can make this a cached
callback.)
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