v4: Delay creating the ScopedValue/ScopedProperty in objectLiteral

Creating a ScopedValue/ScopedProperty is not free. It will use the
ExecutionEngine directly to reserve memory from the JS Stack. In
tests/manual/v4/v8-bench.js and bench-allocate-nonretained.js a lot
of objects are created and the arrayValueCount and the
arrayGetterSetterCount are 0. We can delay the creation for a small
gain.

When generating the code we already know the various sizes and
could already call specialized versions of the creation code. The
gain is not so clear though.

Change-Id: Ic99b241f5506457e57611ad4eba143c56be1f657
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>

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