7087717: G1: make the G1PrintRegionLivenessInfo parameter diagnostic

Reviewed-by: brutisso, ysr

src/share/vm/gc_implementation/g1/g1_globals.hpp

@@ -134,7 +134,7 @@
   develop(bool, G1RSCountHisto, false,                                      \
           "If true, print a histogram of RS occupancies after each pause")  \
                                                                             \
-  product(bool, G1PrintRegionLivenessInfo, false,                           \
+  diagnostic(bool, G1PrintRegionLivenessInfo, false,                        \
             "Prints the liveness information for all regions in the heap "  \
             "at the end of a marking cycle.")                               \
                                                                             \