making variable volatile so it is not removed by the linker, needed f…

…or the NXP TAD plugin

Drivers/freeRTOS/Source/portable/MemMang/heap_4.c

@@ -148,7 +148,11 @@ static void prvHeapInit( void );
 
 /* The size of the structure placed at the beginning of each allocated memory
 block must by correctly byte aligned. */
-static const size_t xHeapStructSize	= ( sizeof( BlockLink_t ) + ( ( size_t ) ( portBYTE_ALIGNMENT - 1 ) ) ) & ~( ( size_t ) portBYTE_ALIGNMENT_MASK );
+#if 0
+static const size_t xHeapStructSize = ( sizeof( BlockLink_t ) + ( ( size_t ) ( portBYTE_ALIGNMENT - 1 ) ) ) & ~( ( size_t ) portBYTE_ALIGNMENT_MASK );
+#else /* << EST do not optimize this variable, needed for NXP TAD plugin */
+static const volatile size_t xHeapStructSize = ( sizeof( BlockLink_t ) + ( ( size_t ) ( portBYTE_ALIGNMENT - 1 ) ) ) & ~( ( size_t ) portBYTE_ALIGNMENT_MASK );
+#endif
 
 /* Create a couple of list links to mark the start and end of the list. */
 static BlockLink_t xStart, *pxEnd = NULL;