runtime: use compileCallback for ctrlhandler This replaces the externalthreadhandler-based implementation of ctrlhandler with one based on compileCallback. This is a step toward eliminating externalthreadhandler. For #45530. Change-Id: I2de2f2f37777af292db67ccf8057b7566aab81f8 Reviewed-on: https://go-review.googlesource.com/c/go/+/309632 Trust: Austin Clements <austin@google.com> Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
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