[Bug 283314] lang/go building go app immediately fails at compile "unexpected return pc for cmd/compile/internal/ssa.Compile"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283314

--- Comment #1 from Mike Watkins <git@mikewatkins.ca> ---
Further looking into this reveals that other non-trivial Go application builds
fail on Vultr in similar manner until the flag GODEBUG=asyncpreemptoff=1  is
included.

The exact module where compile fails varies; successful builds are cached, so
the next failure will be unpredictable. 

The VM was constructed from a 14.1-RELEASE ISO, nothing special. 2 vCPUs, 2GB
RAM completely under-subscribed. It was then updated to 14.2-RELEASE recently;
the problem existed before and after the update and exists using the pkg Go and
the most current version direct from the Go project.

A Linux QEMU issue that seems similar:
https://github.com/golang/go/issues/69255

From https://pkg.go.dev/runtime:

asyncpreemptoff: asyncpreemptoff=1 disables signal-based
asynchronous goroutine preemption. This makes some loops
non-preemptible for long periods, which may delay GC and
goroutine scheduling. This is useful for debugging GC issues
because it also disables the conservative stack scanning used
for asynchronously preempted goroutines.

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