Method put

src/main/java/pascal/taie/util/collection/MultiMap.java:93–93

Stores a key-value pair in this multimap. @return true if the multimap changed.

(@Nonnull K key, @Nonnull V value)

     * @return {@code true} if the multimap changed.
     */
    boolean put(@Nonnull K key, @Nonnull V value);

    /**
     * Stores a key-value pair in this multimap for each of {@code values},