Optimize enclosingInlineds
Optimize enclosingInlineds

inlineContext already normalized most of InlinedCalls, normalize all of it
instead. The new code isn't much more complex, the only tricky bit is assuming
we don't need to normalize the pre-normalized list.

In fact, this can be simplified further!

sjrd/dotty,dotty-staging/dotty,lampepfl/dotty,sjrd/dotty,sjrd/dotty,dotty-staging/dotty,lampepfl/dotty,dotty-staging/dotty,lampepfl/dotty,sjrd/dotty,dotty-staging/dotty,sjrd/dotty,som-snytt/dotty,som-snytt/dotty,dotty-staging/dotty,som-snytt/dotty,lampepfl/dotty,lampepfl/dotty,som-snytt/dotty,som-snytt/dotty