Update RegExp.prototype accessors for ES11 (#4103)

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai daniel.batyai@h-lab.eu

tests/jerry/es.next/builtin-prototypes.js

@@ -50,44 +50,11 @@ try {
   assert (e instanceof TypeError);
 }
 
-try {
-  RegExp.prototype.source;
-  assert (false);
-} catch (e) {
-  assert (e instanceof TypeError);
-}
-
-try {
-  RegExp.prototype.global;
-  assert (false);
-} catch (e) {
-  assert (e instanceof TypeError);
-}
-
-try {
-  RegExp.prototype.ignoreCase;
-  assert (false);
-} catch (e) {
-  assert (e instanceof TypeError);
-}
-
-try {
-  RegExp.prototype.multiline;
-  assert (false);
-} catch (e) {
-  assert (e instanceof TypeError);
-}
-
-try {
-  RegExp.prototype.sticky;
-  assert (false);
-} catch (e) {
-  assert (e instanceof TypeError);
-}
-
-try {
-  RegExp.prototype.unicode;
-  assert (false);
-} catch (e) {
-  assert (e instanceof TypeError);
-}
+assert (RegExp.prototype.source === '(?:)');
+assert (RegExp.prototype.global === undefined);
+assert (RegExp.prototype.ignoreCase === undefined);
+assert (RegExp.prototype.multiline === undefined);
+assert (RegExp.prototype.sticky === undefined);
+assert (RegExp.prototype.unicode === undefined);
+assert (RegExp.prototype.dotAll === undefined);
+assert (RegExp.prototype.flags === '');

tests/jerry/es.next/regexp-flags.js

@@ -61,12 +61,7 @@ var r = /abc/yg;
 m = r.exec ("strabcstr");
 assert (m === null);
 
-try {
-  RegExp.prototype.flags;
-  assert (false);
-} catch (e) {
-  assert (e instanceof TypeError);
-}
+assert (RegExp.prototype.flags === "");
 
 var flagsProp = Object.getOwnPropertyDescriptor (RegExp.prototype, "flags");
 assert(flagsProp.get.call({}) === '');

tests/jerry/es.next/regexp-prototype-source.js

@@ -39,12 +39,7 @@ assert(new RegExp('/\n/').source.length === 6);
 assert(new RegExp(/\/\//).source === '\\/\\/');
 assert(new RegExp(/\?\//g).source === '\\?\\/');
 
-try {
-  RegExp.prototype.source;
-  assert (false);
-} catch (e) {
-  assert (e instanceof TypeError);
-}
+assert (RegExp.prototype.source === '(?:)')
 
 var sourceProp = Object.getOwnPropertyDescriptor (RegExp.prototype, "source");
 try {