Backport "Don't approximate a type using Nothing as prefix" to 3.3 LTS
#521
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Approximate range(Nothing, hi) to Nothing & hi instead of Nothing. This avoids
creating TypeRefs with a Nothing prefix which manifest themselves down the line
with an error like:
Cannot resolve reference to type path.type.AbsMember.
The classfile defining the type might be missing from the classpath.
val z1 = transition(di).ext(1) // error
^
Due to a MissingType thrown from TypeErasure#sigName.
This change required tweaking Type#findMember to handle WildcardTypes instead of
returning NoDenotation. This was only required for two
tests (tests/pos/i7414.scala and tests/pos/i13842.scala) where `wildApprox` ends
up creating a TermRef whose underlying type is a WildcardType, because of a type
parameter being substituted by a wildcard, which seems legitimate when we're using
`wildApprox`.
The presentation compiler also had a special case for Nothing appearing in
completion which had to be adapted.
Fixes scala#23530
[Cherry-picked 9f4179a]
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Backports scala#23531 to the 3.3.7.
PR submitted by the release tooling.
[skip ci]