Implement eval check for ECMAScript code (#4788)

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

docs/02.API-REFERENCE.md

@@ -12035,7 +12035,7 @@ is no longer needed.
 jerry_value_t
 jerry_get_user_value (const jerry_value_t value);
 ```
-- `value` - script / module / function value which executes JavaScript
+- `value` - script / module / function value which executes ECMAScript
             code (native modules / functions do not have user value).
 - return
   - user value - if available,
@@ -12084,6 +12084,60 @@ main (void)
 - [jerry_generate_snapshot](#jerry_generate_snapshot)
 - [jerry_exec_snapshot](#jerry_exec_snapshot)
 
+## jerry_is_eval_code
+
+**Summary**
+
+Checks whether an ECMAScript code is compiled by eval like (eval, new Function,
+[jerry_eval](#jerry_eval), etc.) command.
+
+**Prototype**
+
+```c
+bool jerry_is_eval_code (const jerry_value_t value);
+```
+- `value` - script / module / function value which executes ECMAScript code
+- return
+  - true - if code is compiled by eval like command
+  - false - otherwise
+
+*New in version [[NEXT_RELEASE]]*.
+
+**Example**
+
+[doctest]: # ()
+
+```c
+#include "jerryscript.h"
+
+int
+main (void)
+{
+  jerry_init (JERRY_INIT_EMPTY);
+
+  const jerry_char_t script[] = "eval('(function (a) { return a; })')";
+
+  jerry_value_t script_value = jerry_parse (script, sizeof (script) - 1, NULL);
+  jerry_value_t function_value = jerry_run (script_value);
+  jerry_release_value (script_value);
+
+  if (jerry_is_eval_code (function_value))
+  {
+    /* Code enters here. */
+  }
+
+  jerry_release_value (function_value);
+  jerry_cleanup ();
+  return 0;
+}
+```
+
+**See also**
+
+- [jerry_parse](#jerry_parse)
+- [jerry_generate_snapshot](#jerry_generate_snapshot)
+- [jerry_exec_snapshot](#jerry_exec_snapshot)
+
 ## jerry_get_source_info
 
 **Summary**