[mono][interp] Allow passing vtypes with a single scalar field to nat…

[vargaz]

…ive code using the faster code path.

This affects types like ObjectHandleOnStack which are passed to icalls.

[ghost]

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Issue Details

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…ive code using the faster code path.

This affects types like ObjectHandleOnStack which are passed to icalls.

Author:	vargaz
Assignees:	vargaz
Labels:	area-Codegen-Interpreter-mono
Milestone:	-

[vargaz]

This will hopefully fix some of the perf regressions in
#79607

[vargaz]

On most platforms, passing scalar vtypes is done by value, so this should work. If it doesn't, we can ifdef it for the platforms where it works.

[vargaz]

The interpreter test failures are relevant.

[BrzVlad]

we should probably have consistency between the primitive types that are considered to be passable as a native int and the allowed types of the struct field.

[vargaz]

Failures are unrelated