hg: jdk/submit: 8240840: Rollback whitebox.cpp in push 8240691

[yumin.qi at gmail.com]

Changeset: a67aa7e073d8
Author:    minqi
Date:      2020-03-10 14:37 -0700
URL:       https://hg.openjdk.java.net/jdk/submit/rev/a67aa7e073d8

8240840: Rollback whitebox.cpp in push 8240691
Summary: whitebox.cpp should not change in 8240691, which is accidentally included.
Reviewed-by: iklam, ccheung

! src/hotspot/share/prims/whitebox.cpp