More lambda work: semantic analysis of capturing 'this'.  It's a bit complicated, but we have to be careful about when exactly captures are marked given PotentiallyPotentiallyEvaluated contexts.  (Actually, it's not 100% correct yet, but it's close enough for the moment.)



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147723 91177308-0d34-0410-b5e6-96231b3b80d8
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