compiler: improve t-reg copy elimination.

* optimize.tl (rename): Instead of a mapping operation,
we perform the substitution only until we hit an
instruction that defines either the src or dst register.
(basic-blocks do-peephole-block): Drop the conditions
for doing the rename: that neither register can be
defined somewhere in the rest of the block. This
restriction is too limiting. We have to be careful now;
we cannot delete the first instruction, and must only
set the recalc flag and add to the rescan list if the
substitution did something, to avoid looping.

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