Jay Petacat 28ef79ea80 std: Single-threaded panicImpl sleep is unreachable (#11569) ...

Adding `unreachable` prevents the futex code from being inspected during
a single-threaded build. Without futex, first draft BYOS packages don't
need to implement `nanosleep` to get a single-threaded "hello world"
program working.

Use of `assert()` did not achieve the desired effect of avoiding futex
in a single-threaded build.

2022-05-04 09:43:27 -05:00

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