cmd/compile: do not mark OpSP, OpSB pos for debugging
cmd/compile: do not mark OpSP, OpSB pos for debugging

Fixes #42801

Change-Id: I2080ecacc109479f5820035401ce2b26d72e2ef2
Reviewed-on: https://go-review.googlesource.com/c/go/+/273506
Trust: Cuong Manh Le <54b4457f1dff6823379654eb5867596497ba782f@gmail.com>
Run-TryBot: Cuong Manh Le <54b4457f1dff6823379654eb5867596497ba782f@gmail.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Cherry Zhang <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>
Reviewed-by: David Chase <ae171625adc8645b8b79b7e405a6da5aba5341e0@google.com>

golang/go,nawawi/go,golang/go,golang/go,CAFxX/go,nawawi/go,CAFxX/go,CAFxX/go,nawawi/go,golang/go,golang/go,cloudflare/go,CAFxX/go,cloudflare/go,cloudflare/go,cloudflare/go,cloudflare/go,cloudflare/go,CAFxX/go,nawawi/go,golang/go,cloudflare/go,nawawi/go,golang/go,CAFxX/go,cloudflare/go,CAFxX/go,CAFxX/go,nawawi/go,golang/go,nawawi/go,nawawi/go