SIL: Use SubstitutionMap::mapIntoTypeExpansionContext() in SILTypeSubstituter #81079
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I made a mistake in 47156e0. There was a call to call to forAbstract() in SILTypeSubstituter that passed in the wrong subject type.
This call was inside SILTypeSubstituter's own implementation of replacing opaque types with underlying types in a substitution map. This duplicates an existing utility method in SubstitutionMap anyway, so let's just use that instead.
Fixes rdar://149353285.