Strict equality operators should not be optimistic

As shown by the output of JDK-8161665 test code, long/Long operands are treated optimistically in strict equality operators. This should not be the case as the original type of operands must be preserved in ===/!== (similar to the typeof and instanceof operators).

https://bugs.openjdk.java.net/browse/JDK-8161665?focusedCommentId=13975389&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13975389