fix(gnovm): remove preprocessing variable

[thehowl]

This PR removes the preprocessing global variable.

This was only used in one function; now that we have PreprocessingMode in the machine, we can move this check out of the specific function and into the places where we need to check it

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 41.66667% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/gnolang/op_decl.go	41.17%	8 Missing and 2 partials ⚠️
gnovm/pkg/gnolang/op_assign.go	0.00%	2 Missing and 2 partials ⚠️

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[ltzmaxwell]

LGTM. think we can also clean debugAssertSameTypes and debugAssertEqualityTypes(types.go), the untyped xxx staff.

[thehowl]

LGTM. think we can also clean debugAssertSameTypes and debugAssertEqualityTypes(types.go), the untyped xxx staff.

I'm not sure if you refer to just removing the isUntyped func calls, but seeing as these are meant to be sanity methods to activate during debug I think it may make sense to keep 'em. I'll let you remove them in another PR if you think it should be done