[Lguest] [patch] introduce lgread_ulong/lgwrite_ulong for pointer read/write

[Jes Sorensen]

Hi,

We cannot use lgread_u32/lgwrite_u32 in page_tables.c given pointers
aren't meant to be 32 bit :-)

This patch introduces _ulong versions as an alternative and makes the
page_tables.c code use those instead - should improve portability.

Cheers,
Jes

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