[dev.ssa] cmd/compile: implement control flow handling
Add label and goto checks and improve test coverage. Implement OSWITCH and OSELECT. Implement OBREAK and OCONTINUE. Allow generation of code in dead blocks. Change-Id: Ibebb7c98b4b2344f46d38db7c9dce058c56beaac Reviewed-on: https://go-review.googlesource.com/12445Reviewed-by:Keith Randall <khr@golang.org>
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