eaa198f cmd/compile: stop generating block successor vars in rewrite rules

Authored and Committed by Josh Bleecher Snyder 8 years ago
    cmd/compile: stop generating block successor vars in rewrite rules
    
    They are left over from the days before
    we had BlockKindFirst and swapSuccessors.
    
    Change-Id: I9259d53ac2821ca4d5de5dd520ca4b78f52ecad4
    Reviewed-on: https://go-review.googlesource.com/41206
    Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
    Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>