PATCH: fix building invalid IR lowering initializer list

[Nick Lewycky]

The attached patch fixes a case where we produce an invalid store where the
value type is not the same as the pointee type of the pointer. This occurs
when lowering to a global variable because the GV must have the type of a
pointer to its initializer, yet the initializer is not quite the same that
we use for the value. Fix it up by adding a cast.

Ben, I've cc'd you because I think this is a regression from your r231564.

Please review!

Nick
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