Support static snapshots. (#2239)

Unlike normal snapshots, no part of a static snapshot is loaded into
the RAM when executed from ROM. Static snapshots rely heavily on
external magic strings.

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

jerry-core/ecma/base/ecma-helpers.c

@@ -1487,6 +1487,7 @@ void
 ecma_bytecode_deref (ecma_compiled_code_t *bytecode_p) /**< byte code pointer */
 {
   JERRY_ASSERT (bytecode_p->refs > 0);
+  JERRY_ASSERT (!(bytecode_p->status_flags & CBC_CODE_FLAGS_STATIC_FUNCTION));
 
   bytecode_p->refs--;