Generalize PossibleConstantValues for immutable globals (#4549)

This moves more logic from ConstantFieldPropagation into PossibleConstantValues,
that is, instead of handling the two cases of a Literal or a Name before calling
PossibleConstantValues, move that code into the helper class. That way all users of
PossibleConstantValues can benefit from it. In particular, this makes
DeadArgumentElimination now support optimizing immutable globals, as well as
ref.func and ref.null.

(Changes to test/lit/passes/dae-gc-refine-params.wast are to avoid the new
optimizations from kicking in, so that it still tests what it tested before.)

0 files changed, 0 insertions, 0 deletions