Doug Gregor 24d24c0e63 [AST] Allocate GenericSignature(Builders) in the arena ...

Opaque result type archetypes can involve type variables, which
then get introduced into GenericSignatureBuilders and the
generated GenericSignatures. Allocate them in the proper arena
So we don’t end up with use-after-free errors.

Fixes rdar://problem/50309503.

2019-05-07 06:56:42 -07:00

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