Doug Gregor c7fd48aa67 Rework storage for conformance isolation ...

Switch over to split caching for the conformance isolation request,
which optimizes for the common case where the conformance is
nonisolated. Also put the explicit global actor TypeExpr* in an
ASTContext side table, so we don't take a pointer's worth of storage
in every conformance.

For that side table, introduce a new "ASTContext::GlobalCache" that's
there only for side tables, so we don't have to go add get/set
operations to ASTContext and recompile the world every time we want to
add a side table like this.

Thanks, Slava!

2025-03-13 17:38:54 -07:00

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