Add FreeRTOS-Plus directory.

FreeRTOS/Demo/CORTEX_LM3S316_IAR/registertest.s

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+	RSEG ICODE:CODE
+
+	EXTERN vSetErrorLED
+
+	PUBLIC vSetAndCheckRegisters
+
+vSetAndCheckRegisters:
+	/* Fill the general purpose registers with known values. */
+	mov r11, #10
+	add r0, r11, #1
+	add r1, r11, #2
+	add r2, r11, #3
+	add r3, r11, #4
+	add r4, r11, #5
+	add r5, r11, #6
+	add r6, r11, #7
+	add r7, r11, #8
+	add r8, r11, #9
+	add r9, r11, #10
+	add r10, r11, #11
+	add r12, r11, #12
+
+	/* Check the values are as expected. */
+	cmp r11, #10
+	bne set_error_led
+	cmp r0, #11
+	bne set_error_led
+	cmp r1, #12
+	bne set_error_led
+	cmp r2, #13
+	bne set_error_led
+	cmp r3, #14
+	bne set_error_led
+	cmp r4, #15
+	bne set_error_led
+	cmp r5, #16
+	bne set_error_led
+	cmp r6, #17
+	bne set_error_led
+	cmp r7, #18
+	bne set_error_led
+	cmp r8, #19
+	bne set_error_led
+	cmp r9, #20
+	bne set_error_led
+	cmp r10, #21
+	bne set_error_led
+	cmp r12, #22
+	bne set_error_led
+	bx lr
+
+set_error_led:
+	push {r14}
+	ldr r1, =vSetErrorLED
+	blx r1
+	pop {r14}
+	bx lr
+
+	END
+