cmd/compile: add test generator for control and data flow
From a compact specification of control flow graphs, generate complete set of possible assignment patterns to output y, and also generate an interpretable specification. Compiles (hoping for crash, or not) and then runs, where the run checks function output against interpreted output for various inputs observed to terminate in the interpreter. In ssa_test.go, added ability to generate a test and run (compile and run) the generated test, possibly with modified environment variables. The generated test is compiled including the -D=ssa/check/on flag, and if the interpreter terminates in a small number of steps, then it is also run to check the result. Change-Id: I392c828e36c543411b7733ca0799628452733276 Reviewed-on: https://go-review.googlesource.com/22751 Run-TryBot: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Keith Randall <khr@golang.org>
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