iris: Enable creating an engines based context
Anvil already does this since !8667 (merged), so the first 2 patches move some support to a common area.
Cc: @kwg
Dropped crocus change in v3.
Edited by Jordan Justen
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Anvil already does this since !8667 (merged), so the first 2 patches move some support to a common area.
Cc: @kwg
Dropped crocus change in v3.