Propagate public visibility through all types (#7105)

Previously the classification of public types propagated public
visibility only through types that had previously been collected by
`collectHeapTypes`. Since there are settings that cause
`collectHeapTypes` to collect fewer types, it was possible for public
types to be missed if they were only public because they were reached by
an uncollected types.

Ensure that all public heap types are properly classified by propagating
public visibility even through types that are not part of the collected
output.

Fixes #7103.

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