Remove string copy

Changed 'ecma_copy_or_ref_ecma_string' to 'ecma_ref_ecma_string'. It does
not copy the string if the maximum number of reference counter is reached,
but bails out with an error like the 'ecma_ref_object' function does.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

jerry-core/ecma/operations/ecma-reference.c

@@ -96,7 +96,7 @@ ecma_make_reference (ecma_value_t base, /**< base value */
                      ecma_string_t *name_p, /**< referenced name */
                      bool is_strict) /**< strict reference flag */
 {
-  name_p = ecma_copy_or_ref_ecma_string (name_p);
+  name_p = ecma_ref_ecma_string (name_p);
 
   ecma_reference_t ref;
   ref.base = ecma_copy_value (base);