[PATCH, v2 0/3, resend] generalize exception table implementation to deal with relative pointers

[Jan Beulich]

This will allow x86-64 to shrink its exception tables by half, and ia64 to
drop its custom implementation.

v2: Adjust arch/x86/kernel/test_nx.c (leading to some tests no longer
    getting run on x86-64) and indent some pre-processor directives in
    patch #2.

1/3: x86-64: use macros to generate exception table entries
2/3: x86-64: use relative 32-bit pointers in exception tables
3/3: ia64: drop custom exception table implementation

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

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