Erik Eckstein b7ea3b9bb2 [SIL] Let alloc_existential_box return a single value. ...

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

2016-01-20 11:27:06 -08:00

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