cmd/compile/internal/ssa: regenerate rewrite rules

Running 'go run *.go' in the gen directory resulted in this diff.

Change-Id: Iee398a720f54d3f2c3c122fc6fc45a708a39e45e
Reviewed-on: https://go-review.googlesource.com/109575
Run-TryBot: Michael Munday <mike.munday@ibm.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/compile/internal/ssa/rewritePPC64.go

@@ -13472,10 +13472,12 @@ func rewriteValuePPC64_OpRound_0(v *Value) bool {
 	// match: (Round x)
 	// cond:
 	// result: (FROUND x)
-	x := v.Args[0]
-	v.reset(OpPPC64FROUND)
-	v.AddArg(x)
-	return true
+	for {
+		x := v.Args[0]
+		v.reset(OpPPC64FROUND)
+		v.AddArg(x)
+		return true
+	}
 }
 func rewriteValuePPC64_OpRound32F_0(v *Value) bool {
 	// match: (Round32F x)