Implementing {pre,post}_{incr,decr} opcodes.

src/libecmaobjects/ecma-globals.h

@@ -334,6 +334,16 @@ typedef uint8_t ecma_char_t;
  */
 typedef float ecma_number_t;
 
+/**
+ * Value '0' of ecma_number_t
+ */
+#define ECMA_NUMBER_ZERO ((ecma_number_t) 0)
+
+/**
+ * Value '1' of ecma_number_t
+ */
+#define ECMA_NUMBER_ONE  ((ecma_number_t) 1)
+
 /**
  * Description of arrays'/strings' length
  */