Warning fixes.

ISO C99 doesn’t support unnamed structs/unions.
Comparison of distinct pointer types lacks a cast.
Dereferencing type-punned pointer will break strict-aliasing rules.
Type of bit-field ‘ext’ is a GCC extension.

JerryScript-DCO-1.0-Signed-off-by: Robert Sipka rsipka.uszeged@partner.samsung.com

jerry-core/ecma/operations/ecma-objects-arguments.c

@@ -138,7 +138,7 @@ ecma_op_create_arguments_object (ecma_object_t *func_obj_p, /**< callee function
            indx++)
       {
         // i.
-        if (literal_p[indx].packed_value == MEM_CP_NULL)
+        if (literal_p[indx].u.packed_value == MEM_CP_NULL)
         {
           continue;
         }

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

@@ -37,7 +37,7 @@ typedef struct
   ecma_value_t base;
 
   /** referenced name */
-  mem_cpointer_t referenced_name_cp : ECMA_POINTER_FIELD_WIDTH;
+  __extension__ mem_cpointer_t referenced_name_cp : ECMA_POINTER_FIELD_WIDTH;
 
   /** strict reference flag */
   unsigned int is_strict : 1;