hg: jdk/submit: 8251846: Replace __linux which is no longer defined

[martin.doerr at sap.com]

Changeset: d7370376d20b
Author:    mdoerr
Date:      2020-08-17 10:40 +0200
URL:       https://hg.openjdk.java.net/jdk/submit/rev/d7370376d20b

8251846: Replace __linux which is no longer defined
Reviewed-by: dholmes, goetz

! src/hotspot/share/utilities/debug.cpp