Fix #11701 performance regression (hang) in 2.11dev (#5032)

lib/valueflow.cpp

@@ -9218,6 +9218,7 @@ struct ValueFlowPassRunner {
                 return run(pass);
             }))
                 return true;
+            --n;
         }
         if (state.settings->debugwarnings) {
             if (n == 0 && values != getTotalValues()) {

test/testvalueflow.cpp

@@ -7189,6 +7189,23 @@ private:
                "    }\n"
                "}\n";
         valueOfTok(code, "i");
+
+        code = "void f() {\n" // #11701
+               "    std::vector<int> v(500);\n"
+               "    for (int i = 0; i < 500; i++) {\n"
+               "        if (i < 122)\n"
+               "            v[i] = 255;\n"
+               "        else if (i == 122)\n"
+               "            v[i] = 220;\n"
+               "        else if (i < 386)\n"
+               "            v[i] = 196;\n"
+               "        else if (i == 386)\n"
+               "            v[i] = 118;\n"
+               "        else\n"
+               "            v[i] = 0;\n"
+               "    }\n"
+               "}\n";
+        valueOfTok(code, "i");
     }
 
     void valueFlowCrashConstructorInitialization() { // #9577