There are two types of type lists that can be met in Kotlin metadata
and that should be treated in a different way:
1. The order-sensitive type list. Examples: Context receivers.
2. The order-insensitive type list. Examples: Class supertypes,
type parameter upper bounds.
With (1) swapping elements in list causes source and/or ABI
incompatibility, while with (2) it does not. If it happens that we
compare two type lists in Kotlin metadata of (2) kind, we should group
them using the key computed with the help of
`dumpToString(dumpExtras = false)` instead of just the index as we do
in case of (1).
^KT-62753
Dmitriy Dolovov
8365915b3f