[omniORB] omniORB 4.1 patch: optimize default constructed any

[Teemu Torma]

We are using a union to represent range of different valuse.  CORBA::Any 
is one of the choices that is rarely used, but when running callgrind 
the union constructor was using notable amount of time which was 
dominated by CORBA::Any default constructor.

The attached patch does not assign tc_null as the default typecode but 
leaves the typecode nil instead and handles this on the access time 
instead.  Duplicating typecodes takes a mutex which is the slow part.  
With this patch, CORBA::Any default constructor and the union 
constructor dropped below the callgrind “radar screen.”

Teemu
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