Fix test 82/04 widening gas

The old test had no widening at all, since there was only one side
effect per variable.

Also changed so that one variable has more side effects than gas.

Author: arkocal

tests/regression/82-widening_gas/04-side_simple_update.c

@@ -1,4 +1,4 @@
-// PARAM: --set solvers.td3.side_widen always --set solvers.td3.side_widen_gas 3 --enable ana.int.interval --enable exp.earlyglobs
+// PARAM: --set solvers.td3.side_widen always --set solvers.td3.side_widen_gas 2 --enable ana.int.interval --enable exp.earlyglobs
 #include <pthread.h>
 #include <goblint.h>
 
@@ -12,11 +12,18 @@ void *thread(void *arg) {
   pthread_mutex_lock(&A);
   a = 1;
   b = 1;
-  b = 2;
   c = 1;
+  pthread_mutex_unlock(&A);
+
+  pthread_mutex_lock(&A);
+  b = 2;
   c = 2;
   c = 3;
   pthread_mutex_unlock(&A);
+
+  pthread_mutex_lock(&A);
+  c = 4;
+  pthread_mutex_unlock(&A);
   return NULL;
 }
 
@@ -28,7 +35,7 @@ int main(void) {
   pthread_mutex_lock(&A);
   __goblint_check(a <= 1);
   __goblint_check(b <= 2);
-  __goblint_check(c <= 3);
+  __goblint_check(c <= 4); // UNKNOWN!
   pthread_mutex_unlock(&A);
   return 0;
 }