Use UBaseType_t as interrupt mask (#689)

* Use UBaseType_t as interrupt mask
* Update GCC posix port to use UBaseType_t as interrupt mask
diff --git a/queue.c b/queue.c
index 27776f0..23e9704 100644
--- a/queue.c
+++ b/queue.c
@@ -1099,7 +1099,7 @@
                                      const BaseType_t xCopyPosition )
 {
     BaseType_t xReturn;
-    portBASE_TYPE xSavedInterruptStatus;
+    UBaseType_t uxSavedInterruptStatus;
     Queue_t * const pxQueue = xQueue;
 
     configASSERT( pxQueue );
@@ -1127,7 +1127,7 @@
      * read, instead return a flag to say whether a context switch is required or
      * not (i.e. has a task with a higher priority than us been woken by this
      * post). */
-    xSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
+    uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
     {
         if( ( pxQueue->uxMessagesWaiting < pxQueue->uxLength ) || ( xCopyPosition == queueOVERWRITE ) )
         {
@@ -1252,7 +1252,7 @@
             xReturn = errQUEUE_FULL;
         }
     }
-    portCLEAR_INTERRUPT_MASK_FROM_ISR( xSavedInterruptStatus );
+    portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
 
     return xReturn;
 }
@@ -1262,7 +1262,7 @@
                               BaseType_t * const pxHigherPriorityTaskWoken )
 {
     BaseType_t xReturn;
-    portBASE_TYPE xSavedInterruptStatus;
+    UBaseType_t uxSavedInterruptStatus;
     Queue_t * const pxQueue = xQueue;
 
     /* Similar to xQueueGenericSendFromISR() but used with semaphores where the
@@ -1298,7 +1298,7 @@
      * link: https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
     portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
 
-    xSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
+    uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
     {
         const UBaseType_t uxMessagesWaiting = pxQueue->uxMessagesWaiting;
 
@@ -1418,7 +1418,7 @@
             xReturn = errQUEUE_FULL;
         }
     }
-    portCLEAR_INTERRUPT_MASK_FROM_ISR( xSavedInterruptStatus );
+    portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
 
     return xReturn;
 }
@@ -1933,7 +1933,7 @@
                                  BaseType_t * const pxHigherPriorityTaskWoken )
 {
     BaseType_t xReturn;
-    portBASE_TYPE xSavedInterruptStatus;
+    UBaseType_t uxSavedInterruptStatus;
     Queue_t * const pxQueue = xQueue;
 
     configASSERT( pxQueue );
@@ -1955,7 +1955,7 @@
      * link: https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
     portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
 
-    xSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
+    uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
     {
         const UBaseType_t uxMessagesWaiting = pxQueue->uxMessagesWaiting;
 
@@ -2015,7 +2015,7 @@
             traceQUEUE_RECEIVE_FROM_ISR_FAILED( pxQueue );
         }
     }
-    portCLEAR_INTERRUPT_MASK_FROM_ISR( xSavedInterruptStatus );
+    portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
 
     return xReturn;
 }
@@ -2025,7 +2025,7 @@
                               void * const pvBuffer )
 {
     BaseType_t xReturn;
-    portBASE_TYPE xSavedInterruptStatus;
+    UBaseType_t uxSavedInterruptStatus;
     int8_t * pcOriginalReadPosition;
     Queue_t * const pxQueue = xQueue;
 
@@ -2049,7 +2049,7 @@
      * link: https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
     portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
 
-    xSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
+    uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
     {
         /* Cannot block in an ISR, so check there is data available. */
         if( pxQueue->uxMessagesWaiting > ( UBaseType_t ) 0 )
@@ -2070,7 +2070,7 @@
             traceQUEUE_PEEK_FROM_ISR_FAILED( pxQueue );
         }
     }
-    portCLEAR_INTERRUPT_MASK_FROM_ISR( xSavedInterruptStatus );
+    portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
 
     return xReturn;
 }