pass -faddress-sanitizer when --asan is set, [Coke]++
integrate set with previous instruction if possible

cases where an operation sets an intermediate register that
only gets read by a set immediately following that operation
occur frequently enough that this should be worth the tiny
bit of analysis work.
non-passed optional parameters make some BBs unreachable

they don't get removed yet, perhaps because they are still
referred to by the dominance tree?
re-activate optimize_can_op; survives spec tests now.
turning stuff into sets should also cause fact copying
when bindlex fails, we should report "bindlex", not "getlex"
takeclosure is a very popular allocating op.
Small fix
expose callsite interning for extops
jit randscale_n through a little helper function
accidentally public'd the wrong function
lexicals show their name now (if possible)
Only look at MVM_NFA_DEB env var once.

It's horribly expensively to access it repeatedly on Windows.
guard special cases with a single test
calculate longlit offset at last litchar
guard special cases with a single test
jit cmp_i
forgot to add cmp_i to jgb_consume_ins
jit isnanorinf
jit cmp_n