Augusto Noronha f41d192b48 Implement projectExistentialAndUnwrapClass ...

Implement a version of projectExistential tailored for LLDB. There are 2
differences when projecting existentials for LLDB:

1 - When it comes to existentials, LLDB stores the address of the error
    pointer, which must be dereferenced.
2 - When the existential wraps a class type, LLDB expects the address
    returned is the class instance itself and not the address of the
    reference.

This patch also adapts the swift reflection test machinery to test
projectExistentialAndUnwrapClass as well. This is done by exposing
the new functionality from swift reflection test.  It is tested in
existentials.swift, and ensures that the typeref information is
exactly the same as what is expected from projectExistential,
except the out address.

(cherry picked from commit 55e971e06750c3ba29722d558cc5400298f6bdaf)

2021-06-16 08:54:50 -03:00

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