optimize debug mode when reallocs are the same size and fix page-aligned realloc WRT memcpying the old region to the correct new position when guard_after
optimize debug mode when reallocs are the same size and fix page-aligned realloc WRT memcpying the old region to the correct new position when guard_after

git-svn-id: f2acecaac6fbd5a03f3d4799db58dda434111981@13603 3eda493b-6a19-0410-b2e0-ec8ea4dd8fda

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/pfl,pscedu/slash2-stable,pscedu/pfl,pscedu/pfl,pscedu/slash2-stable,pscedu/pfl,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable