[PATCH] Refactor tryCaptureVariable using ExtractMethod and fix another TemplateParameterDepth Bug

[Faisal Vali]

As I was working on captures within Generic Lambdas, I thought it would be
nice to refactor the very long function : tryCaptureVariable. Please let me
know if you think this refactoring is useful and if you have any
suggestions for improving the refactoring.

Also, I fixed a bug in my initial TemplateParameterDepth patch - the Depth
counter was getting incremented when it shouldn't have (that is for a
non-class template) in delayed-template parsing mode.  I included a test
that previously asserted, and now compiles and behaves as it should.

Thank you in advance for the feedback.

Faisal Vali
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