Hamish Knight 01d5c00f9b [Sema] Requestify default arg type checking ...

This commit introduces a request to type-check a
default argument expression and splits
`getDefaultValue` into 2 accessors:

- `getStructuralDefaultExpr` which retrieves the
potentially un-type-checked default argument
expression.

- `getTypeCheckedDefaultExpr` which retrieves a
fully type-checked default argument expression.

In addition, this commit adds `hasDefaultExpr`,
which allows checking for a default expr without
kicking off a request.

2019-11-11 13:49:06 -08:00

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