opt: don't clear streams of bytes on the stack

All over the Mu code I reflexively initialize all variables just to keep
unsafe SubX easy to debug. However I don't really need to do this for safe
Mu code, since the type- and memory-safety already ensures we can't read
from streams beyond what we've written to them. For now I'll continue mostly
with the same approach, but with one exception for streams of bytes.

Mu programs often emit traces, and in doing so they often use temporary
streams of bytes that can get quite long. I'm hoping avoiding initializing
KBs of data all over the place will measurably speed up the Mu shell.

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