Add testcase, fix executable memory allocated in shared dram/iram region

components/freertos/include/freertos/heap_regions.h

@@ -58,6 +58,15 @@ void vPortDefineHeapRegionsTagged( const HeapRegionTagged_t * const pxHeapRegion
  */
 void *pvPortMallocTagged( size_t xWantedSize, BaseType_t tag );
 
+/**
+ * @brief Free memory allocated with pvPortMallocTagged
+ *
+ * This is basically an implementation of free().
+ *
+ * @param  pv Pointer to region allocated by pvPortMallocTagged
+ */
+void vPortFreeTagged( void *pv );
+
 /**
  * @brief Get the lowest amount of memory free for a certain tag
  *