hg: jdk10/hs/hotspot: 8168542: os::realloc should return a valid pointer for input size=0

[david.holmes at oracle.com]

Changeset: fb71f497860f
Author:    stuefe
Date:      2016-10-24 14:51 +0200
URL:       http://hg.openjdk.java.net/jdk10/hs/hotspot/rev/fb71f497860f

8168542: os::realloc should return a valid pointer for input size=0
Reviewed-by: dholmes, cjplummer, dsamersoff, rehn

! src/share/vm/runtime/os.cpp