cpu: de-duplicate some of the operators and refactor (ggml/1144)

* cpu: de-duplicate some of the operators and refactor

* Fix PR comments

* Fix PR comments

ggml/src/ggml-cpu/binary-ops.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void ggml_compute_forward_add_non_quantized(const struct ggml_compute_params * params, struct ggml_tensor * dst);
+void ggml_compute_forward_sub(const struct ggml_compute_params * params, struct ggml_tensor * dst);
+void ggml_compute_forward_mul(const struct ggml_compute_params * params, struct ggml_tensor * dst);
+void ggml_compute_forward_div(const struct ggml_compute_params * params, struct ggml_tensor * dst);
+
+#ifdef __cplusplus
+}
+#endif