[metadata] Do less initialization in mono_class_is_assignable #73786
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Instead of running the full mono_class_init_internal, just initialize the supertypes and the interface bitmap. Add a flag to mono_class_setup_interface_offsets to only publish the interface bitmap, not the offsets. Also move the SRE hack (setting a field in MonoClass to null and running mono_class_setup_interface_offsets) to a new function mono_class_invalidate_interface_offsets. Also change the field that the SRE hack uses as a sentinel (used to be MonoClass:interfaces_packed, now MonoClass:interface_offsets_packed) Fixes dotnet#68033
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Instead of running the full mono_class_init_internal, just initialize
the supertypes and the interface bitmap.
Add a flag to mono_class_setup_interface_offsets to only publish the
interface bitmap, not the offsets.
Also move the SRE hack (setting a field in MonoClass to null and
running mono_class_setup_interface_offsets) to a new function
mono_class_invalidate_interface_offsets.
Also change the field that the SRE hack uses as a sentinel (used to be
MonoClass:interfaces_packed, now MonoClass:interface_offsets_packed)
Fixes #68033