compiler: move peephole pattern and remove condition.

* stdlib/optimize.tl (basic-blocks do-peephole-block):
Remove the local function only-locally-used-treg.
This is unnecessary because the optimization is valid
even if the treg is used in downstream basic blocks.
It was necessary previously in the old version of
this optimization in which we deleted the first
instruction which sets the treg's value. We are now
depending on it being identified as a dead register.
Also, moving the rule to the end. The reason is
that there are cases when the pattern matches, but
it returns insns. That causes the rewrite macro to
march down to the next instruction, skipping other
patterns. This could be bad, unless the pattern is the
last one tried before the @else fallback.

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