Implement XL layer - preliminary work.

vendor/github.com/klauspost/reedsolomon/galois_noasm.go

@@ -0,0 +1,19 @@
+//+build !amd64 noasm appengine
+
+// Copyright 2015, Klaus Post, see LICENSE for details.
+
+package reedsolomon
+
+func galMulSlice(c byte, in, out []byte) {
+	mt := mulTable[c]
+	for n, input := range in {
+		out[n] = mt[input]
+	}
+}
+
+func galMulSliceXor(c byte, in, out []byte) {
+	mt := mulTable[c]
+	for n, input := range in {
+		out[n] ^= mt[input]
+	}
+}