Zeroing out value-type return value

When FJIT generates the code for a call, FJIT appears
to check whether the method has a value-type return
value and if so checks to see which portions of the
value type contain references (FJIT.cpp::2520 =>
jitInfo->getClassGClayout(sigInfo->retTypeClass,gcInfo)).  
FJIT then appears to use the contents of gcInfo to
determine which parts of the return buffer to zero out
so that the GC won't believe there is a valid reference
there.  My question is, why not just zero out the whole
return buffer and save the work of determining where the
pointers are?  If for some reason I wanted to skip
checking the location of the pointers and zero out the
whole return buffer would this cause any correctness
problems or is it purely a performance issue?

thanks,

Todd

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