Improve optimization of call_ref into direct calls (#4068)

First, move the tiny pattern of call-ref-of-ref-func from Directize
into OptimizeInstructions. This is important because Directize is
a global optimization pass - it looks at the table to see if a
CallIndirect can be turned into a direct call. We only run global
passes at the end of the pipeline, but we don't need any global
data for call-ref of a ref-func, and OptimizeInstructions is the
place for such patterns.

Second, extend that to also handle fallthrough values. This is
less simple, but as call_ref is so inefficient, it's worth doing all
we can.

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