RFR 8221698 Remove redundant includes from popular header files

[coleen.phillimore at oracle.com]

Hey Ioi, while you're here, can you remove SuperTypeClosure from 
instanceKlass.hpp.

And don't forget to remove the commented out:

+//#include "classfile/moduleEntry.hpp"
+//#include "classfile/packageEntry.hpp"

Looks good! Thank you for cleaning up the include files more.

Coleen

On 3/29/19 12:33 PM, Ioi Lam wrote:
> https://bugs.openjdk.java.net/browse/JDK-8221698
> http://cr.openjdk.java.net/~iklam/jdk13/8221698-remove-redundant-includes.v01/ 
>
>
> The following files are included by some popular header files. This 
> causes them to be included by almost all HotSpot C files. However, 
> these header are for features that are not commonly used. Excluding 
> them can improve HotSpot build speed by 1~2%.
>
>   histogram.hpp
>   classLoader.hpp
>   utf8.hpp
>   moduleEntry.hpp
>   packageEntry.hpp
>
> Thanks
> - Ioi