Use custom dispatcher for Global object's routines (#2794)

Binary size gain:
     - Intel: ~780B (gcc-7.3)
     - Arm: ~450B (arm-linux-gnueabi-gcc-7.3)

The change also contains the renovation of each builtin routine to use early return in case of error to make the code less complicated.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

tests/jerry/global-uri-coding.js

@@ -102,7 +102,7 @@ assert (decodeURIComponent ("%70%71%72%73%74%75%76%77%78%79%7a%7b%7c%7d%7e") ===
 assert (decodeURI ("%6A%6B%6C%6D%6E%6F") === "jklmno");
 assert (decodeURI ("%C3%A9") === "\xe9");
 assert (decodeURI ("%e2%b1%a5") === "\u2c65");
-/* assert (decodeURI ("%f0%90%90%a8") === "\ud801\udc28"); */
+assert (decodeURI ("%f0%90%90%a8") === "\ud801\udc28");
 
 checkDecodeURIParseError ("13%");
 checkDecodeURIParseError ("%0g");