compiler: compress symbol tables also.

When functions are optimized away due to constant folding,
instead of replacing them with a nil, we now compact the
table to close the gaps and renumber the references in the
code.

* stdlib/compiler.tl (compiler null-stab): Method removed.
(compiler compact-dregs): Renamed to compact-dregs-and-syms.
Now compacts the symbol table also. This is combined with
D-reg compacting because it makes just two passes through
the instruction: a pass to identify the used D registers
and symbol indices, and then another pass to edit the
instructions with the renamed D registers and renumbered
symbol indices.
(compiler optimize): Remove the call to the null-unused-data
on the basic-blocks object; nulling out D regs and symbol
table entries is no longer required. Fllow the rename of
compact-dregs to compact-dregs-and-syms which is called
the same way otherwise.

* stdlib/optimize.tl (basic-blocks null-unused-data):
No longer used method removed.

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