tests: suppress warnings in seq.tl.

When tests/012/compile.tl compiles tests/012/seq.tl, there
are now some compiler warnings due to constant expressions
that throw. We introduce a new compiler option to suppress
them, and then use it.

* stdlib/comp-opts.tl: New file. The definitions related
to compiler options are moved here out of compile.tl,
so that optimize.tl can use them.

* stdlib/compiler.tl (compile-opts, %warning-syms%,
when-opt, *compile-opts*, opt-controlled-diag): Moved to
comp-opts.tl. New constant-throws option added to
compile-opts and %warning-syms%.
(safe-constantp): Make the constant expression throws
diagnostic conditional on the new option.

* stdlib/optimize.tl: Load comp-opts file.
(basic-blocks do-peephole-block): Make diagnostic
about throwing situation subject to constant-throws
option.

* tests/012/seq.tl: Turn off constant-throws warning
option before the ref tests that work with ranges.
Fix: one of the expressions calls refs with the
wrong number of arguments, which was unintentional.

* txr.1: Document new diagnostic option.

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