George Karpenkov baa78cc6d3 [analyzer] Track non-zero values in ReturnVisitor ...

Tracking those can help to provide much better diagnostics in many cases.

In general, most of the visitor machinery should be refactored to allow
tracking the origin of arbitrary values.

rdar://36039765

Differential Revision: https://reviews.llvm.org/D51131

llvm-svn: 340475

2018-08-22 23:17:25 +00:00

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