hg: jdk/sandbox: 8220346: Refactor java.lang.Throwable to use Objects.requireNonNull

[chris.hegarty at oracle.com]

Changeset: 1bc8513104f2
Author:    darcy
Date:      2019-03-11 11:23 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/1bc8513104f2

8220346: Refactor java.lang.Throwable to use Objects.requireNonNull
Reviewed-by: lancea, mchung, tvaleev, forax, martin, plevart

! src/java.base/share/classes/java/lang/Throwable.java