Add line info support. (#2286)

Add line info data to byte, which allows getting a backtrace info directly
from the engine. Snapshots are not supported.

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

jerry-core/vm/vm-defines.h

@@ -51,6 +51,10 @@ typedef struct vm_frame_ctx_t
   struct vm_frame_ctx_t *prev_context_p;              /**< previous context */
   ecma_value_t this_binding;                          /**< this binding */
   ecma_value_t call_block_result;                     /**< preserve block result during a call */
+#ifdef JERRY_ENABLE_LINE_INFO
+  ecma_value_t resource_name;                         /**< current resource name (usually a file name) */
+  uint32_t current_line;                              /**< currently executed line */
+#endif /* JERRY_ENABLE_LINE_INFO */
   uint16_t context_depth;                             /**< current context depth */
   uint8_t is_eval_code;                               /**< eval mode flag */
   uint8_t call_operation;                             /**< perform a call or construct operation */