Reverted f088588c fix for #6187 that fixes infinite loop, the fix cause a use-after-free regression.

lib/tokenize.cpp

@@ -9091,7 +9091,8 @@ void Tokenizer::simplifyWhile0()
         if (Token::simpleMatch(tok->next()->link(), ") {")) {
             Token *end = tok->next()->link();
             end = end->next()->link();
-            eraseDeadCode(tok->previous(), end->next());
+            tok = tok->previous();
+            eraseDeadCode(tok, end->next());
         }
     }
 }

test/testsimplifytokens.cpp

@@ -2375,16 +2375,6 @@ private:
 
         ASSERT_EQUALS("void foo ( ) { exit ( 0 ) ; }",
                       tokWithStdLib("void foo() { do { exit(0); } while (true); }"));
-
-        // #6187
-        tokWithStdLib("void foo() {\n"
-                      "  goto label;\n"
-                      "  for (int i = 0; i < 0; ++i) {\n"
-                      "    ;\n"
-                      "label:\n"
-                      "    ;\n"
-                      "  }\n"
-                      "}");
     }
 
     void strcat1() {