Backport "Drop phase.isTyper use in isLegalPrefix/asf" to 3.3 LTS #121
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Note that "asSeenFrom" (aka asf) is used by SymDenotation#findMember,
which is used by TypeComparer's "hasMatchingMember", as a part of
"compareRefinedSlow".
Previously (using the minimisation in i17222.8.scala) `summonOne` is
inlined during the "inlining" phase, while "summonInline" is inlined
during typing. The result is that during inlining we fail to find
`Reader[BC, Int]` because we incorrectly consider `A{type F = Int}` as
stable.
Note that "asSeenFrom" (aka asf) is used by SymDenotation#findMember,
which is used by TypeComparer's "hasMatchingMember", as a part of
"compareRefinedSlow".
Previously (using the minimisation in i17222.8.scala) `summonOne` is
inlined during the "inlining" phase, while "summonInline" is inlined
during typing. The result is that during inlining we fail to find
`Reader[BC, Int]` because we incorrectly consider `A{type F = Int}` as
stable.
[Cherry-picked 26ecda5][modified]
[Cherry-picked 0293318]
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Backports scala#21954 to the 3.3.6.
PR submitted by the release tooling.