cmd/compile/internal/ssa: generate code via a //go:generate directive

The standard way to generate code in a Go package is via //go:generate
directives, which are invoked by the developer explicitly running:

	go generate import/path/of/said/package

Switch to using that approach here.

This way, developers don't need to learn and remember a custom way that
each particular Go package may choose to implement its code generation.
It also enables conveniences such as 'go generate -n' to discover how
code is generated without running anything (this works on all packages
that rely on //go:generate directives), being able to generate multiple
packages at once and from any directory, and so on.

Change-Id: I0e5b6a1edeff670a8e588befeef0c445613803c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/460135
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

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