Reviewed-by: tonyp, ysr

Summary: Removed the assert: UseSerialGC is not necessarily always set when serial gc is being used.
Reviewed-by: jcoomes, jmasa, tonyp

6889757: G1: enable card mark elision for initializing writes from compiled code (ReduceInitialCardMarks)
Summary: Defer the (compiler-elided) card-mark upon a slow-path allocation until after the store  and before the next subsequent safepoint; G1 now answers yes to can_elide_tlab_write_barriers().
Reviewed-by: jcoomes, kvn, never

Summary: Restore original null checks.
Reviewed-by: never, cfang

Summary: Use -y zip option to preserve symbolic links.
Reviewed-by: never, jcoomes, kamg

Reviewed-by: jrose, kvn, cfang, twisti

Summary: PhiNode::Ideal() should return TOP for Phi node with no users.
Reviewed-by: never, jrose

Summary: Restore the original code: uint i = _hi_degree.
Reviewed-by: never, jrose

Reviewed-by: twisti, jrose, kvn

Reviewed-by: never
Contributed-by: gbenson@redhat.com

Summary: Update the HS17 build number to 03
Reviewed-by: jcoomes

Summary: What the title says. We don't use SIMPLE_STACK any more.
Reviewed-by: ysr

Reviewed-by: kvn

Summary: To break spill ties choose bound live range over unbound to free register or one with smaller cost to spill.
Reviewed-by: never, jrose

Summary: See title.
Reviewed-by: jmasa, ysr, jcoomes, iveresov, tonyp

Summary: change more guarantees in concurrent marking into asserts.
Reviewed-by: apetrusenko, iveresov

Summary: Remove incorrect guarantee.
Reviewed-by: apetrusenko, iveresov

Summary: Fix problem with the double register encodings in sparc.ad
Reviewed-by: never, jrose
Contributed-by: volker.simonis@gmail.com

Summary: For signatures with a large number of arguments the offset for the float store becomes too big and does not fit in 13-bit.
Reviewed-by: kvn, never

Summary: When we copy objects to survivors during marking, we incorrectly set NTAMS to bottom, which causes marking to miss visiting some of those objects.
Reviewed-by: apetrusenko, iveresov

Summary: It tidies up the G1 heap verification a bit. In particular, when the verification is done in parallel and there is a failure, this is propagated to the top level and the heap is dumped at the end, not by every thread that encounters a failure.
Reviewed-by: johnc, jmasa

Summary: When G1 is enabled, thread dumps are inconsistent as the info for some of the G1 threads is not formatted properly.
Reviewed-by: ysr, johnc

Reviewed-by: iveresov

Summary: Modify operand passed to C1 pre-barrier to be the operand representing the address of the object field that is being stored.
Reviewed-by: never

Summary: Add IgnoreUnrecognizedVMOptions for JTreg tests (on a product build) to pass with DeoptimizeALot
Reviewed-by: kvn

Summary: Avoid ideal transformation ping-pong between AddPNode::Ideal() and CastX2PNode::Ideal().
Reviewed-by: cfang

Summary: Update the HS17 build number to 02
Reviewed-by: jcoomes

Reviewed-by: never, ysr, acorn

Summary: After mechanically merging changes, some by-hand adjustments are needed.
Reviewed-by: ysr