hg: build-infra/jdk9/hotspot: Improve optimization and debug symbol flags for windows

[ingemar.aberg at oracle.com]

Changeset: 4ec85a5313d3
Author:    iaberg
Date:      2015-11-19 06:29 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/hotspot/rev/4ec85a5313d3

Improve optimization and debug symbol flags for windows

! makefiles/Common.gmk
! makefiles/JvmFeaturesConf.gmk
! makefiles/JvmPlatforms.gmk