[0/8] GBpages support for x86-64, v2

This patch series supports using the new GB pages introduced with 
AMD Quad Cores for the kernel direct mapping.

I addressed all reasonable feedback for the previous version I believe.

Changes against previous version:
- Ported on top of latest git-x86 with PAT series
- Fixed some white space
- Clarify clear_kernel_mapping comments
- Minor cleanups

-Andi
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