[clang][dataflow] Various changes to handling of modeled fields.

- Rename `getReferencedFields()` to `getModeledFields()`. Move the logic that
  returns all object fields when doing a context-sensitive analysis to here from
  `DataflowAnalysisContext::createStorageLocation()`. I think all callers of
  the previous `getReferencedFields()` should use this logic; the fact that they
  were not doing so looks like a bug.

- Make `getModeledFields()` public. I have an upcoming patch that will need to
  use this function from Transfer.cpp, and there doesn't seem to be any reason
  why this function should not be public.

- Use a `SmallSetVector` to get deterministic iteration order. I have a pending
  patch where I'm getting flaky tests because
  `Environment::createValueUnlessSelfReferential()` is non-deterministically
  populating different fields depending on the iteration order. This change
  fixes those flaky tests.

Reviewed By: gribozavr2

Differential Revision: https://reviews.llvm.org/D154586

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