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It can NPE or trigger static class initilization, we can't elimiate
it without changing semantics.
To make sure we don't thwart closure elimination, I've allowed DCE
to eliminate a non-static LOAD_FIELD of a member of a closure class.
It would be more general to track nullity of the reciever (e.g, `this`
or `new Foo` cannot be null), but that would require more
infrastructure in this phase.
I've added a test for closure inlining based on a a suggestion by
@dragos. This actually passes if we remove the (LOAD_FIELD, DROP)
peephole optimization for `closelim` altogether. But I chose to
adapt that optimization (only allow it for non-static, closure
fields), rather then remove it alogether, in the interests of
treading lightly.
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