Pointer arithmetic error

[David Given <dg@cowlark.com>]

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I've just found what I think is a bug. In evaluate_ptr_add(), in
evaluate.c, are the following lines:

	/* Get the size of whatever the pointer points to */
	multiply = base->bit_size >> 3;

This divides the bit size by 8 to get the size in bytes. However, this
doesn't take into account that bits_in_char might not be 8. I think this
should actually be:

	/* Get the size of whatever the pointer points to */
	multiply = base->bit_size / bits_in_char;

(This now produces the right result on my non-8-bit-char 'platform'.)

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