[m-rev.] for post-commit review: requantify after inlining

[Zoltan Somogyi]

For review by anyone. The attached DIFF.diet.c shows the effect of the change
on diet.c.

By the way, I got the idea for this change when I saw messages like this from
the C# compiler:

Mercury/css/diet.cs(386,25): warning CS0219: The variable `TypeInfo' is assigned but its value is never used

Zoltan.
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