(XS) RFR: 7008747: Header files with conditional behaviour can not be precompiled

[Gerald Thornbrugh]

Hi David,

Your changes look good.

Jerry
> Bug: https://bugs.openjdk.java.net/browse/JDK-7008747
>
> webrev: http://cr.openjdk.java.net/~dholmes/7008747/webrev/
>
> A trivial clean up to ensure no confusion. The bug might be better 
> described in the reverse sense: files that modify the behaviour of 
> included headers must not use precompiled headers.
>
> In this case the code looks like it is using PCH when in fact it will 
> be disabled on this platform. Better to be 100% clear (like the PPC 
> code involving the same definitions) and not include precompiled.hpp
>
> If any zero folk see this then zero may also want a cleanup here as it 
> defines DONT_USE_REGISTER_DEFINES, but doesn't seem to include and 
> headers that are conditionalized on that value.
>
> Thanks,
> David