Memory leak and/or excessive compiler memory use in 32-bit systems

[Taylor R Campbell]

I haven't been able to do a complete test run on 32-bit systems for a
while.  If I run `make check', it consistently runs out of memory
trying to compile test-floenv.scm or test-flonum.scm.  However, if I
just compile the file in a fresh Scheme, it works fine, so

(a) there's probably some memory leak in the test suite, and
(b) there's probably some excessive compiler data structures.

I tried the attached string of patches to work around this, and it
worked to get test-floenv.scm compiling, and it made some progress
through test-flonum.scm, but it still runs out of memory partway
through.

This is not a very high priority so I'm not going to spend much more
time on it for a while.

32bit.patch
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