Make generated complex drop-ins

Again this is to allow simpler code generation of other BLAS routines.

asm/caxpy.go

@@ -0,0 +1,22 @@
+// Generated code do not edit. Run `go generate`.
+
+// Copyright ©2015 The gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package asm
+
+// The extra z parameter is needed because of floats.AddScaledTo
+func CaxpyUnitary(alpha complex64, x, y, z []complex64) {
+	for i, v := range x {
+		z[i] = alpha*v + y[i]
+	}
+}
+
+func CaxpyInc(alpha complex64, x, y []complex64, n, incX, incY, ix, iy uintptr) {
+	for i := 0; i < int(n); i++ {
+		y[iy] += alpha * x[ix]
+		ix += incX
+		iy += incY
+	}
+}