Remove redundant call to SetFree for objects bigger than 4GB

[Alikhalesi]

Fix #119424

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[jkotas]

Suggested change

	((CObjectHeader*)x)->SetFree(size);
	((CObjectHeader*)x)->SetFree(size);

Indentation is off (applies to the rest of the code as well)

[jkotas]

Is it really necessary to clear these interim syncblocks? Can we keep "Also clear the syncblock" before #ifndef HOST_64BIT and delete it here?