Summary: Add a use of the node cx to avoid it being destroyed.
Backport from JDK-8217359: https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8217359
This patch of OpenJDK is available here: https://hg.openjdk.java.net/jdk/jdk12/rev/44f41693631f

Test Plan: test/compiler/c2/Test8217359.java

Reviewed-by: luchsh, kuaiwei

Issue: https://github.com/alibaba/dragonwell8/issues/11

Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

Summary: Add IgnoreUnrecognizedVMOptions for JTreg tests (on a product build) to pass with DeoptimizeALot
Reviewed-by: kvn

Summary: developed a reexecute logic for the interpreter to reexecute the bytecode when deopt happens
Reviewed-by: kvn, never, jrose, twisti

Summary: The compiler tests of 6636138 fail with an IllegalAccessException.
Reviewed-by: kvn

Summary: Remove the wrong flag -XX:+UseSuperword to fix the Nightly failure
Reviewed-by: kvn, never

Summary: Fixed SuperWord scheduling of memory operations.
Reviewed-by: kvn, never