Add all the main machinery

Add functions size_shared, copy_shared_calculate and copy_shared_perform.
Add the infrastructure for making these communicate with each other.
Add debug information to other places in the VM, to watch interaction
with the sharing-preserving copy.

CAUTION: If you define the SHCOPY_DEBUG macro (after SHCOPY is actually
used in the VM) and make the whole OTP, there will be a lot of debugging
messages during make (it will also be enabled in erlc).  You have been
warned...

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