[interp] Add super instructions for field storing (mono/mono#17525)

[interp] Add super instructions for field storing (mono/mono#17525)

* [interp] Add also floating versions for stloc.np

* [interp] Add super instructions for stfld

When storing into a field of a local or an argument (ldloc/ldarg -> random instructions that end up pushing one value -> stfld). We add this instruction to the cprop pass because the instructions that are optimized together are not consecutive and we need the stack information to be able to access the instruction that loaded the argument / local and to make sure that the local wasn't dirtied. Alternatively we could make the super instruction pass stack aware, which we should probably do if more super instruction candidates turn out to require stack state information.

* [interp] Enable cprop for methods without locals

We do some optimizations here that don't apply to locals.

* [interp] Fix result stack type of CEE_CONV_OVF_I_UN

Commit migrated from https://github.com/mono/mono/commit/b7ef7363382757c2951a7a84026d5a1baa7f0130