8163014: Mysterious/wrong value for "long" frame local variable on 64-bit
Summary: The high byte of a long variable on a 64-bit platform is now zeroed when it is pushed to stack.
Reviewed-by: coleenp, dlong
8164948: Initializing stores of HeapRegions are not ordered with regards to their use in G1ConcurrentMark
Summary: Add a storestore barrier before publishing newly initialized HeapRegion instances, and place a loadload barrier before use of members.
Reviewed-by: sjohanss, sangheki