Doug Gregor 599e07e5d9 [Type checker] Keep the type checker alive as long as the ASTContext is. ...

It is possible for the SIL optimizers, IRGen, etc. to request information
from the AST that only the type checker can provide, but the type checker
is typically torn down after the “type checking” phase. This can lead to
various crashes late in the compilation cycle.

Keep the type checker instance around as long as the ASTContext is alive
or until someone asks for it to be destroyed.

Fixes SR-285 / rdar://problem/23677338.

2018-10-10 16:44:42 -07:00

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