[Bug 1057] memory leak & increasing slowdown in pdubuf.c buf_pin / interp.c update_bounds

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Comment # 5 on bug 1057 from Ken McDonell

Update.

The problem is not in the core of interp.c, which is a relief (I'll change the
bug title to reflect the root cause when I'm done).

Rather, pmwebd has a use case that we've not seen before, namely creating and
closing lots of PCP contexts in the life of a single process ... there are a
number of memory leaks in the archive context case, especially when
interpolation mode is being used.  The unexpectedly pinned PDU buffers Frank
has observed is one symptom ... I have a fix for this ... but there are other
sources of memory leaks I want to fix at the same time.

Then a lot of QA before I commit the changes.

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