Merge #21633: refactor: add [[noreturn]] attribute where applicable

003929c0d5 refactor: add [[noreturn]] attribute where applicable (fanquake)

Pull request description:

  Similar to #10843. We could build with `-Wmissing-noreturn`, however that would also mean modifying something like `--suppress-external-warnings` to suppress warnings for leveldb, which I don't think we want to do. In any case, the functions where this is applicable are only added/removed very rarely.

ACKs for top commit:
  vasild:
    ACK 003929c0d5

Tree-SHA512: 33dfa6547d6b84f38a941f24d4c2effe8fde7b93dbc0b27a9309716420e4a879fdbe689d789fa5439d65f5f78292f89fd9dc1b61c97acf69316dfed954086705

src/test/util_tests.cpp

@@ -1766,7 +1766,7 @@ static constexpr char LockCommand = 'L';
 static constexpr char UnlockCommand = 'U';
 static constexpr char ExitCommand = 'X';
 
-static void TestOtherProcess(fs::path dirname, std::string lockname, int fd)
+[[noreturn]] static void TestOtherProcess(fs::path dirname, std::string lockname, int fd)
 {
     char ch;
     while (true) {