Erik Eckstein 8110b1ebc8 [SIL] Let alloc_box return a single value. ...

And use project_box to get to the address value.
SILGen now generates a project_box for each alloc_box.
And IRGen re-uses the address value from the alloc_box if the operand of project_box is an alloc_box.
This lets the generated code be the same as before.

Other than that most changes of this (quite large) commit are straightforward.

2016-01-19 08:59:24 -08:00

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