[LLVMdev] [PATCH] - Union types, replaceUsesOfWithOnConstant

[Talin]

Here's the implementation of ConstantUnion::replaceUsesOfWithOnConstant().
No tests yet :(

Two questions:

-- Any suggestions as to an existing test I could use as a model for testing
this?
-- I could also use some advice on what part of the code to work on next (in
terms of finishing up union support).

-- 
-- Talin
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