hg: jdk/hs: 8152957: Improve specificity of safepoint logging to print safepoint type

[coleen.phillimore at oracle.com]

Changeset: de2e4ff493bf
Author:    coleenp
Date:      2017-12-20 10:05 -0500
URL:       http://hg.openjdk.java.net/jdk/hs/rev/de2e4ff493bf

8152957: Improve specificity of safepoint logging to print safepoint type
Summary: upgrade safepoint begin logs to Info logging, which has the reason.
Reviewed-by: dholmes, hseigel, zgu

! src/hotspot/share/runtime/safepoint.cpp