Update to the latest atomic.h.

Improve commenting in RISC-V GCC port.
Fix IAR RISC-V port so the first task starts with interrupts enabled.
Add references to third party page ref using newlib with FreeRTOS into the tasks.c file in each place newlib is referenced.
Move the position of the traceTASK_DELETE() trace macro in case of use with a memory allocator that writes over freed memory even when inside a critical section.
Efficiency improvement:  Make sure xTaskIncrementTick() does not return pdTRUE when the scheduler is locked.  This just prevents an unnecessary yield interrupt (unnecessary as it is ignored) when xYieldPending happens to be pdTRUE.

FreeRTOS/Source/portable/GCC/RISC-V/portmacro.h

@@ -65,6 +65,13 @@ typedef portBASE_TYPE BaseType_t;
 typedef portUBASE_TYPE UBaseType_t;
 typedef portUBASE_TYPE TickType_t;
 
+/* Legacy type definitions. */
+#define portCHAR		char
+#define portFLOAT		float
+#define portDOUBLE		double
+#define portLONG		long
+#define portSHORT		short
+
 /* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
 not need to be guarded with a critical section. */
 #define portTICK_TYPE_IS_ATOMIC 1