cmd/compile: convert race cleanup rule to typed aux

Passes toolstash-check.

Change-Id: I3005210cc156d01a6ac1ccaafb4311c607681bf0
Reviewed-on: https://go-review.googlesource.com/c/go/+/229691
Reviewed-by: Keith Randall <[email protected]>

Author: josharian

src/cmd/compile/internal/ssa/gen/generic.rules

@@ -2391,7 +2391,7 @@
 				(Store {t5} (OffPtr <tt5> [o5] dst) d4
 					(Zero {t1} [n] dst mem)))))
 
-(StaticCall {sym} x) && needRaceCleanup(sym,v) -> x
+(StaticCall {sym} x) && needRaceCleanup(sym, v) => x
 
 // Collapse moving A -> B -> C into just A -> C.
 // Later passes (deadstore, elim unread auto) will remove the A -> B move, if possible.

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

@@ -1340,12 +1340,12 @@ func registerizable(b *Block, typ *types.Type) bool {
 }
 
 // needRaceCleanup reports whether this call to racefuncenter/exit isn't needed.
-func needRaceCleanup(sym interface{}, v *Value) bool {
+func needRaceCleanup(sym Sym, v *Value) bool {
 	f := v.Block.Func
 	if !f.Config.Race {
 		return false
 	}
-	if !isSameSym(sym, "runtime.racefuncenter") && !isSameSym(sym, "runtime.racefuncexit") {
+	if !symNamed(sym, "runtime.racefuncenter") && !symNamed(sym, "runtime.racefuncexit") {
 		return false
 	}
 	for _, b := range f.Blocks {