cmd/compile/internal/ssa: simplify `s = s <op> x` to `s <op>= x`

Change-Id: I366b89e35d194ca2a7eb97a8253497bd3fc2af94
Reviewed-on: https://go-review.googlesource.com/c/go/+/142019
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

diff --git a/src/cmd/compile/internal/ssa/redblack32_test.go b/src/cmd/compile/internal/ssa/redblack32_test.go
index 1ec29760728daea2dba0706316d57ae421354f0e..376e8cff8ddc0b947b67af045d7b6bada2e73a28 100644 (file)
--- a/src/cmd/compile/internal/ssa/redblack32_test.go
+++ b/src/cmd/compile/internal/ssa/redblack32_test.go
@@ -134,15 +134,15 @@ func (t *RBTint32) DebugString() string {
 func (t *node32) DebugString() string {
        s := ""
        if t.left != nil {
-               s = s + "["
-               s = s + t.left.DebugString()
-               s = s + "]"
+               s += "["
+               s += t.left.DebugString()
+               s += "]"
        }
-       s = s + fmt.Sprintf("%v=%v:%d", t.key, t.data, t.rank)
+       s += fmt.Sprintf("%v=%v:%d", t.key, t.data, t.rank)
        if t.right != nil {
-               s = s + "["
-               s = s + t.right.DebugString()
-               s = s + "]"
+               s += "["
+               s += t.right.DebugString()
+               s += "]"
        }
        return s
 }