There is at least one CI job which builds a toolchain without asserts: [main] 1. OSS - Swift (Tools Opt+No Assert, Stdlib Opt+DebInfo, Test Simulator) - macOS [Jenkins]. There may or may not be more, I didn't look too closely. You can also ask @swift-ci to build a specific preset from utils/build-presets.ini but I rarely do that so I don't recall how to do it exactly off the top of my head.
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