bug#12892: ‘gc-stats’ w/o ‘bytes-malloced’

[Thien-Thi Nguyen]

In pre-2.x Guile, ‘gc-stats’ returns an alist w/ keys:

 gc-time-taken
 cells-allocated
 total-cells-allocated
 cell-heap-size
 bytes-malloced
 gc-malloc-threshold
 gc-times
 gc-mark-time-taken
 cells-marked
 cells-swept
 malloc-yield
 cell-yield
 protected-objects
 cell-heap-segments

In Guile 2.0.6, the keys are now:

 gc-time-taken
 heap-size
 heap-free-size
 heap-total-allocated
 heap-allocated-since-gc
 protected-objects gc-times

I think the NEWS should mention this change and the documentation should
summarize what the fields mean.  Practically speaking, i am interested
mostly in the 2.x equivalent for pre-2.x ‘bytes-malloced’, as its lack
causes Guile-SDL to fail "make check DEBUG=1":

.ttn.make-check.log.gz
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by tripping up proc:

 (define (malloced)
   ;; prudence or superstition?  you be the judge!
   (gc) (gc)
   (assq-ref (gc-stats) 'bytes-malloced))
 
in test/leak.scm.  A related issue is how the error is reported.  It
seems strange that the file is "unknown".

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Thien-Thi Nguyen ..................................... GPG key: 4C807502
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