memory: Introduce size_memop

The memory_region_dispatch_{read|write} operand "unsigned size" is
being converted into a "MemOp op".

Introduce no-op size_memop to aid preparatory conversion of
interfaces.

Once interfaces are converted, size_memop will be implemented to
return a MemOp from size in bytes.

Signed-off-by: Tony Nguyen <tony.nguyen@bt.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <35b8ee74020f67cf40848fb7d5f127cf96c851d6.1566466906.git.tony.nguyen@bt.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/exec/memop.h

@@ -107,4 +107,14 @@ typedef enum MemOp {
     MO_SSIZE = MO_SIZE | MO_SIGN,
 } MemOp;
 
+/* Size in bytes to MemOp.  */
+static inline unsigned size_memop(unsigned size)
+{
+    /*
+     * FIXME: No-op to aid conversion of memory_region_dispatch_{read|write}
+     * "unsigned size" operand into a "MemOp op".
+     */
+    return size;
+}
+
 #endif