cmd/compile: use len(s)<=cap(s) to remove more bounds checks
When we discover a relation x <= len(s), also discover the relation x <= cap(s). That way, in situations like: a := s[x:] // tests 0 <= x <= len(s) b := s[:x] // tests 0 <= x <= cap(s) the second check can be eliminated. Fixes #16813 Change-Id: Ifc037920b6955e43bac1a1eaf6bac63a89cfbd44 Reviewed-on: https://go-review.googlesource.com/33633 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Alexandru Moșoi <alexandru@mosoi.ro> Reviewed-by:
David Chase <drchase@google.com>
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