some primitives for emitting traces

Kinda hacky, but might scale enough for machine code.

This was really hard to debug. Single tests passed, but when I ran all
tests I got breakage because tests long before (from the 056trace layer)
were not cleaning up properly.

My instinct was to call clear-stream on Trace-stream, which was wrong
(the trace didn't have the wrong contents, it was literally a bad
object). It was also wrong in a counter-productive way: calling
clear-stream on a real Trace stream (which is the size of a page of
memory) takes a long time in emulated mode.

1 files changed, 0 insertions, 0 deletions

diff --git a/subx/apps/crenshaw2-1 b/subx/apps/crenshaw2-1
index 48703de1..7caeb9af 100755
--- a/subx/apps/crenshaw2-1
+++ b/subx/apps/crenshaw2-1
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