[orc-rt] Rename SimpleNativeMemoryMap finalize & deallocate. NFCI. (#163114)

This commit renames the "finalize" operation to "initialize", and
"deallocate" to "deinitialize".

The new names are chosen to better fit the point of view of the
ORC-runtime and executor-process: After memory is *reserved* it can be
*initialized* with some content, and *deinitialized* to return that
memory to the reserved region.

This seems more understandable to me than the original scheme, which
named these operations after the controller-side JITLinkMemoryManager
operations that they partially implemented. I.e.
SimpleNativeMemoryMap::finalize implemented the final step of
JITLinkMemoryManager::finalize, initializing the memory in the executor;
and SimpleNativeMemoryMap::deallocate implemented the final step of
JITLinkMemoryManager::deallocate, running dealloc actions and releasing
the finalized region.

The proper way to think of the relationship between these operations now
is that:

1. The final step of finalization is to initialize the memory in the
executor.

2. The final step of deallocation is to deinitialize the memory in the
executor.

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