rjmccall accepted this revision.
rjmccall added a comment.
This revision is now accepted and ready to land.
In that case, you probably will not be able to test this difference, because
the argument is basically required to be the address of a local variable, a
parameter, or null (or a various things that propagate such values). And our
IR-generation scheme for parameters will never make them just an llvm::Argument.
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