Michael Gottesman 9747214e92 [silgen] Refactor WritebackScope functionality into a new FormalEvaluationScope. ...

As per John, WritebackScope was always an unfortunate name. Generally these
scopes are meant for formal evaluations of inout parameters. The cases that I am
interested in generalizing them to be used for are borrows of the base of a
class that will then be used as an lvalue.

This also eliminates the out of line vector of lvalue writebacks.

rdar://29791263

2017-02-14 13:15:23 -08:00

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