Suppress warning for IAR compiler as well

drivers/MbedCRC.h

@@ -32,6 +32,8 @@ but we check for ( width < 8) before performing shift, so it should not be an is
 #elif defined ( __GNUC__ )
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wshift-count-negative"
+#elif defined (__ICCARM__)
+#pragma diag_suppress=Pe062  // Shift count is negative
 #endif
 
 namespace mbed {
@@ -457,6 +459,7 @@ private:
 #if   defined ( __CC_ARM )
 #elif defined ( __GNUC__ )
 #pragma GCC diagnostic pop
+#elif defined (__ICCARM__)
 #endif
 
 /** @}*/