Update parser early return type in ESNEXT (#3742)

This patch updates the early return types in the parser to SyntaxError instead of ReferenceError
in ESNEXT

This patch also includes a lot of tests for LeftHandSideExpression validation when using the = operator

JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

tests/jerry/es.next/regression-test-issue-3819.js

@@ -13,8 +13,8 @@
 // limitations under the License.
 
 try {
-  typeof (global.v2) = 123;
+  eval('typeof (global.v2) = 123');
   assert (false);
 } catch (e) {
-  assert (e instanceof ReferenceError);
+  assert (e instanceof SyntaxError);
 }