updated diff for trace-based primitive debugger

[Fergus Henderson]

Zoltan committed the following diff:

>mercury_regs.h:
...
>+/* saved_reg(save_area, n) accesses the given save area instead of fake_reg */
>+
>+#define saved_reg(save_area, n)	\
>+	LVALUE_COND((n) > MAX_REAL_REG, \
>+		r(n), \
>+		save_area[virtual_reg_map[(n) - 1]])
 
This is buggy, because `r(n)' indirectly refers to `fake_reg'.

Also the comment would be clearer if it said
"saved_reg(save_area, n) is like virtual_reg(n), except that it ...".

Please post all non-trivial changes for review.
In the case where you have a long diff that has already been reviewed
and you are making further changes as a result of that review, please
post a diff relative to the previous diff posted.

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