[cfe-commits] Handle ExprWithCleanups when creating goto scopes

[Rafael Espíndola]

> If you check out CGExpr.cpp's EmitExprForReferenceBinding(), it handles all of the cases where we can end up extending the lifetime of a temporary. I suggest following that, rather than trying to halt an arbitrary RecursiveASTVisitor.

There are lots of cases :-(
I decided to try to refactor and share the code. While it works, I
don't have a good name for the auxiliary functions.

I have split the patch in 3 to try to make it easier to see what is going on.

>         - Doug

Cheers,
Rafael
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