[Crash-utility] crash-4.0.2.12 PPC64 changes to make it understand 64k pagesize

[Badari Pulavarty]

Hi Dave & Haren,

Here are the changes I made to "crash" to function with PPC64 
64k pagesize. Instead of adding whole set of indexs, shifts, 
masks, macros and new vtop() routines - I generalized 4-level 
pagetable support and set & compute indexes, shift and masks 
correctly for 4K and 64K.

Tested with 4K pagesize and 64K pagesize kernels on PPC64.
Please review.

Thanks,
Badari


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