8142484: Let IHOP follow the current capacity, not the maximum capacity Summary: Instead of following the current heap capacity, let all IHOP calculations follow the maximum capacity. Reviewed-by: brutisso, jmasa

8078673: Update TEST.groups for recent GC tests Summary: Updates the needs_g1gc list in TEST.groups and adds appropriate "@requires vm.gc" annotations to a few GC tests. Reviewed-by: tschatzl, dfazunen

Merge