layers: Clean up result variable declarations for GetRead<>(), GetWrite<>(), Get<>() and shared_ptr<>.get() #3714
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For GetRead<>, GetWrite<> and Get<>, adding const to the return value declaration makes the returned pointer object const, which is irrelevant. The pointer held by the object should already have the appropriate constness.
But shared_ptr<>.get() returns a raw pointer that should have 'const' and / or '*' in the declaration for a variable holding its result.
This was raised as a problem in PR #3659