Run unreachableCode checking only on executable scopes (#5789)

lib/checkother.cpp

@@ -1110,7 +1110,12 @@ void CheckOther::checkUnreachableCode()
     if (!_settings->isEnabled("style"))
         return;
 
-    for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
+    const SymbolDatabase* symbolDatabase = _tokenizer->getSymbolDatabase();
+    const std::size_t functions = symbolDatabase->functionScopes.size();
+    for (std::size_t i = 0; i < functions; ++i) {
+        const Scope * scope = symbolDatabase->functionScopes[i];
+
+        for (const Token* tok = scope->classStart; tok != scope->classEnd; tok = tok->next()) {
             const Token* secondBreak = 0;
             const Token* labelName = 0;
             if (tok->link() && Token::Match(tok, "(|[|<"))
@@ -1179,6 +1184,7 @@ void CheckOther::checkUnreachableCode()
             }
         }
     }
+}
 
 void CheckOther::duplicateBreakError(const Token *tok, bool inconclusive)
 {

test/testother.cpp

@@ -2983,6 +2983,14 @@ private:
               "    };\n"
               "}", 0, false, false, false, false);
         ASSERT_EQUALS("", errout.str());
+
+        // #5789
+        check("struct per_state_info {\n"
+              "    uint64_t enter, exit;\n"
+              "    uint64_t events;\n"
+              "    per_state_info() : enter(0), exit(0), events(0) {}\n"
+              "};", 0, false, false, false, false);
+        ASSERT_EQUALS("", errout.str());
     }