Merge branch '213-codegen-takes-forever' of gitlab.tiker.net:inducer/loopy into 213-codegen-takes-forever

iupd should depend on yoink for deterministic code generation

See merge request !403

Move import to top level

See merge request !402

[schedule]: schedule_as_many_run_insns_as_possible not performing correctly in the case of parallel_inames

Scheduling goes from 177s to 82s

Merge branch '177-stack-exhaustion-in-check_variable_access_ordered' into '177-stack-exhaustion-in-check_variable_access_ordered'

Don't recompute insn_ids_to_try if nothing changed

See merge request !401

This accounts for 10% of codegen time for sumpy m2l 3d order 6

June monster maint

See merge request !399

Empty ndrange enqueue

See merge request !396