Make use of the EVEN assembler directive in the IAR MSP430X port layer.

Source/portable/IAR/MSP430X/portext.s43

@@ -104,6 +104,7 @@ portRESTORE_CONTEXT macro
  */
 	
 	RSEG CODE
+	EVEN
 	
 vPortTickISR:
 	
@@ -124,6 +125,8 @@ vPortTickISR:
 /*
  * Manual context switch called by the portYIELD() macro.
  */
+ 	EVEN
+	
 vPortYield:
 
 	/* The sr needs saving before it is modified. */
@@ -148,6 +151,8 @@ vPortYield:
  * Start off the scheduler by initialising the RTOS tick timer, then restoring
  * the context of the first task.
  */
+ 	EVEN
+	
 xPortStartScheduler:
 
 	/* Setup the hardware to generate the tick.  Interrupts are disabled