Reviewed-by: twisti, dcubed

Reviewed-by: never, twisti
Contributed-by: NHiroshi Yamauchi <yamauchi@google.com>

Reviewed-by: twisti

Summary: With Zero on a GC crash the stack was dumped differently to other crashes.
Reviewed-by: twisti
Contributed-by: NGary Benson <gbenson@redhat.com>

Summary: Two new files are missing in the push for 6941224.
Reviewed-by: twisti
Contributed-by: NGary Benson <gbenson@redhat.com>

Reviewed-by: twisti

Summary: The fix for 6940701 broke Zero.
Reviewed-by: twisti
Contributed-by: NGary Benson <gbenson@redhat.com>

Summary: Adding stack overflow checking to Shark brought to light a bunch of deficiencies in Zero's stack overflow code.
Reviewed-by: twisti
Contributed-by: NGary Benson <gbenson@redhat.com>

Reviewed-by: twisti

Summary: This fixes lir_cmp_l2i on x64 and sparc 64bit, and the debug info generation.
Reviewed-by: never

6941529: SharedRuntime::raw_exception_handler_for_return_address must reset thread MethodHandle flag
Summary: During testing a bug was hit when an exception returned to the interpreter and the SP was wrong.
Reviewed-by: kvn, never

Summary: Use BIS instruction for allocation prefetch on Sparc
Reviewed-by: twisti

Summary: Humongous regions may contain multiple objects as a result of being retained as to-space from a previous GC and then re-used as to-space after being tagged as humongous. These changes include a check that causes retained to-space regions that are now tagged as humongous to be disregarded and a new to-space region allocated.
Reviewed-by: tonyp, iveresov

Summary: Use FieldsAllocationStyle=2 to allocate non static oop fields in super and sub classes together
Reviewed-by: twisti

Summary: Don't align loops in stubs for Niagara sparc since NOPs are expensive.
Reviewed-by: twisti, never

Summary: For large arrays we should use 64 bytes chunks copy.
Reviewed-by: twisti

Summary: Make sure that two marking cycles do not overlap, i.e., a new one can only start after the concurrent marking thread finishes all its work. In the fix I piggy-back a couple of minor extra fixes: some general code reformatting for consistency (only around the code I modified), the removal of a field (G1CollectorPolicy::_should_initiate_conc_mark) which doesn't seem to be used at all (it's only set but never read), as well as moving the "is GC locker active" test earlier into the G1 pause / Full GC and using a more appropriate method for it.
Reviewed-by: johnc, jmasa, jcoomes, ysr

Summary: ScavengeRootsInCode can lead to unfixed code-embedded oops.
Reviewed-by: kvn, never

Summary: Calling the methods region_stack_push() and region_stack_pop() concurrent is not MT-safe. The assumption is that we will only call region_stack_push() during a GC pause and region_stack_pop() during marking. Unfortunately, we also call region_stack_push() during marking which seems to be introducing subtle marking failures. This change introduces lock-based methods for pushing / popping to be called during marking.
Reviewed-by: iveresov, johnc

Summary: Fix typo.
Reviewed-by: never

Summary: Enable parallel RSet updating and scanning.
Reviewed-by: iveresov, jmasa

Summary: Update the HS18 build number to 02
Reviewed-by: jcoomes

Reviewed-by: kvn

Summary: Get java.io.tmpdir property in os::get_temp_directory() and call this instead of harcoding "/tmp".  Don't assume trailing file_separator either.
Reviewed-by: dholmes, kamg

Reviewed-by: never
Contributed-by: ed@camswl.com

Summary: The changes of 6934494 have broken the Zero build.
Reviewed-by: twisti
Contributed-by: NGary Benson <gbenson@redhat.com>