SwitchNotWellFormed: Address compiler compat

Declarations cannot appear just after case labels.

Author: lcartey

c/common/test/rules/switchnotwellformed/SwitchNotWellFormed.expected

@@ -1,3 +1,3 @@
-| test.c:4:3:10:3 | switch (...) ...  | $@ statement not well formed because this $@ block uses a statement that is not allowed. | test.c:4:3:10:3 | switch (...) ...  | Switch | test.c:5:3:5:9 | case ...: | case |
-| test.c:13:3:20:3 | switch (...) ...  | $@ statement not well formed because this $@ block uses a statement that is not allowed. | test.c:13:3:20:3 | switch (...) ...  | Switch | test.c:14:3:14:10 | case ...: | case |
-| test.c:25:3:30:3 | switch (...) ...  | $@ statement not well formed because this $@ block uses a statement that is not allowed. | test.c:25:3:30:3 | switch (...) ...  | Switch | test.c:26:3:26:9 | case ...: | case |
+| test.c:4:3:11:3 | switch (...) ...  | $@ statement not well formed because this $@ block uses a statement that is not allowed. | test.c:4:3:11:3 | switch (...) ...  | Switch | test.c:5:3:5:9 | case ...: | case |
+| test.c:14:3:21:3 | switch (...) ...  | $@ statement not well formed because this $@ block uses a statement that is not allowed. | test.c:14:3:21:3 | switch (...) ...  | Switch | test.c:15:3:15:10 | case ...: | case |
+| test.c:26:3:31:3 | switch (...) ...  | $@ statement not well formed because this $@ block uses a statement that is not allowed. | test.c:26:3:31:3 | switch (...) ...  | Switch | test.c:27:3:27:9 | case ...: | case |

c/common/test/rules/switchnotwellformed/test.c

@@ -3,6 +3,7 @@ void f1();
 void f2(int p1) {
   switch (p1) {
   case 1:
+    f1();
     int y = p1; // NON_COMPLIANT - `DeclStmt` whose parent
     // statement is the switch body
     f1();