update phony, add mobile versions of util bytes functions that don't try to store anything

src/util/bytes_other.go

@@ -0,0 +1,18 @@
+//+build !mobile
+
+package util
+
+import "sync"
+
+// This is used to buffer recently used slices of bytes, to prevent allocations in the hot loops.
+var byteStore = sync.Pool{New: func() interface{} { return []byte(nil) }}
+
+// Gets an empty slice from the byte store.
+func GetBytes() []byte {
+	return byteStore.Get().([]byte)[:0]
+}
+
+// Puts a slice in the store.
+func PutBytes(bs []byte) {
+	byteStore.Put(bs)
+}