Convert certain push number opcodes to literals (#2328)

Binary operations are much faster with literal arguments.
The byte immediates are still kept for other cases, e.g. array declarations.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/unit-core/test-snapshot.c

@@ -216,7 +216,7 @@ main (void)
     /* Check the snapshot data. Unused bytes should be filled with zeroes */
     const uint8_t expected_data[] =
     {
-      0x4A, 0x52, 0x52, 0x59, 0x0C, 0x00, 0x00, 0x00,
+      0x4A, 0x52, 0x52, 0x59, 0x0D, 0x00, 0x00, 0x00,
       0x00, 0x00, 0x00, 0x00, 0x48, 0x00, 0x00, 0x00,
       0x01, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
       0x03, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00,