compiler: don't null tregs before closure.

* stdlib/compiler.tl (compiler eliminate-frame): New optional
no-tregs parameter. If true, it disables the generation of
code to null the tregs.
(compiler comp-lambda-impl): Pass t to no-regs parameter of
eliminate-frame to disable the nulling. It is not required
for a lambda which executes which fresh t-registers,
implicitly initialized to nil.  The presence of these
instructions prevents the when-match pattern from matching,
which expects the instruction sequence to start with a
close instruction, so that the effect of eliminate-frame
is then lost.  This is a latent bug exposed by the previous
commit. We would have seen this previously in a lambda
occurring inside a loop.

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