Fix ZeroBundle wrapping for GlobalRef PhiNode args

[topolarity]

These are not legal to insert in-place for PhiNodes. Without this change:

272 ┄─ %3410  = φ (#270 => bsim4_vamodel.bsim4_module.NaN, #271 => %3409)::Incidence(Float64, )

is transformed into

272 ┄─ %3341  = (ZeroBundle{1})(bsim4_vamodel.bsim4_module.NaN)::Any
│      %3342  = φ (#270 => %3341, #271 => %3340)::Any

We have to reach back into the preceding basic block and insert the bundle there instead. This solution is a bit of a hack, but at least it gets things working for now.

[topolarity]

This needs some tests and is a bit of hack, but I wanted to open early in case @Keno or @oxinabox feel inspired to finish it up properly.

[codecov]

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Additional details and impacted files

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##             kf/forcedar     #212   +/-   ##
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  Misses                 ?     1249           
  Partials               ?        0           

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[Keno]

Only const GlobalRefs are allowed in value position, so you can take the value out and wrap it in the zero bundle and use that in value position, no needs to insert the extra call.

[topolarity]

Oh that's much better, thanks!

[oscardssmith]

is this ready to merge?