8020277: Young GC could be extremely slow due to assertion in ObjectStartArray::object_starts_in_range
8009462: Young GC's (ParNewGC and SerialGC) have unexpected variances.
Summary: Removed the assertion slowing down GC.
Reviewed-by: stefank, mgerdin

Reviewed-by: brutisso, tschatzl

Reviewed-by: brutisso, tschatzl

Reviewed-by: tschatzl, pliden

Reviewed-by: tschatzl, pliden

Summary: enable type speculation
Reviewed-by: kvn

Summary: check fr.sender_sp() in java thread instead of os::is_first_C_frame(&fr).
Reviewed-by: twisti, coleenp

8035841: assert(dp_src->tag() == dp_dst->tag()) failed: should be same tags 1 != 0 at ciMethodData.cpp:90
Summary: concurrent update of traps with construction of ciMethodData
Reviewed-by: kvn, twisti

Summary: favor profile data coming from outer most method
Reviewed-by: kvn, twisti

Summary: Add support for BMI1 instructions
Reviewed-by: kvn, roland

Summary: added missing check for loop padding case.
Reviewed-by: kvn, jrose

Summary: There is race condition between os::interrupt and os::is_interrupted on Windows. In JVM_Sleep(Thread.sleep), check if thread gets interrupted, it may see interrupted but not really interrupted so cause spurious waking up (early return from sleep). Fix by checking if interrupt event really gets set thus prevent false return. For intrinsic of _isInterrupted, on Windows, go fastpath only on bit not set.
Reviewed-by: acorn, kvn
Contributed-by: david.holmes@oracle.com, yumin.qi@oracle.com

8025644: java/util/stream/test/org/openjdk/tests/java/util/stream/ToArrayOpTest.java fails with TestData$OfRef): failure java.lang.AssertionError: expected [true] but found [false]
Summary: In GraphKit::gen_checkcast() provide only exact superklass to GraphKit::maybe_cast_profiled_receiver()
Reviewed-by: kvn, roland

Reviewed-by: dcubed, mgronlun

8031752: Failed speculative optimizations should be reattempted when root of compilation is different
Summary: support for speculative traps that keep track of the root of the compilation in which a trap occurs.
Reviewed-by: kvn, twisti

Summary: Remove search in system dictionary and hacks, replace with verifying in CLD::_klasses list.
Reviewed-by: dcubed, acorn

Reviewed-by: mgerdin, jmasa
Contributed-by: matthias.baesken@sap.com

Summary: Moved test code inside INCLUDE_ALL_GCS
Reviewed-by: stefank, ehelin

Summary: Move redo of ParkEvent.unpark() after JVMTI_EVENT_MONITOR_WAITED event handler is called.
Reviewed-by: rdurbin, acorn, sspitsyn, dsimms, dholmes

Summary: Revert JDK-6976350 because it does not improve PLAB fragmentation. To the contrary, it tends to increase the amount of wasted space with many threads.
Reviewed-by: brutisso

Summary: Move G1ParCopyClosure::copy_to_survivor_space to decrease code size.
Reviewed-by: stefank, jmasa

Summary: Remove the assumption that G1CollectedHeap::in_cset_fast_test needs to check for NULL references. Most of the time this is not required, making the code doing this check multiple times.
Reviewed-by: stefank, mgerdin, jmasa

Summary: Move methods that are not dependent on any of G1ParCopyClosure's template parameters into G1ParCopyHelper. Further remove unused methods and members of the class hierarchy.
Reviewed-by: mgerdin, stefank

Summary: AltHashing used jint the way of juint in bit shifting which could lead loss of precision. Fix  by change _seed defined as juint.
Reviewed-by: coleenp, ccheung
Contributed-by: yumin.qi@oracle.com

Reviewed-by: tonyp, tschatzl

Summary: When string and symbol table unlink are not performed in parallel, the claim index we check is not updated, and so a guarantee fails. Take this into account when checking the guarantee.
Reviewed-by: brutisso, jwilhelm

8033106: Wrong predicate for checking whether the correct amount of symbol table entries have been processed in G1
Summary: The change fixes the predicate check.
Reviewed-by: jmasa, tonyp, stefank

Summary: Clean up and slightly optimize reference handling from the GC reference task queue. Since we never push partial array chunks as narrowOop* we can manually specialize the code so that some code can be optimized away.
Reviewed-by: tonyp, brutisso, stefank

Summary: Made the flags Min- and MaxHeapFreeRatio manageable, and implemented support for these flags in ParallelGC.
Reviewed-by: sla, mgerdin, brutisso

Summary: Switch off EliminateAutoBox flag by default in jdk8 release.
Reviewed-by: iveresov

Reviewed-by: tschatzl, stefank, jmasa

8028553: The JVM should not throw VerifyError when 'overriding' a static final method in a superclass.
Summary: Check if method is static before throwing exception.
Reviewed-by: kamg, coleenp, lfoltan, fparain

Summary: Move the option to obsolete options list, purge the redundant compiler code.
Reviewed-by: kvn, jrose

Summary: type methods shouldn't always operate on speculative part
Reviewed-by: kvn, twisti

Summary: Use spin lock to manage ParkEvent and PlatformEvent free lists.
Reviewed-by: dholmes, fparain, dcubed, acorn

Summary: use the HAS_PENDING_EXCEPTION and CLEAR_PENDING_EXCEPTION macros
Reviewed-by: dholmes, coleenp, dcubed

Summary: added JNI exception pending check in several files under src/share/vm/prims directory
Reviewed-by: coleenp, minqi

8030027: nsk/jvmti/scenarios/hotswap/HS101/hs101t006 Crashed the vm on Linux-amd64: SIGSEGV in JavaThread::last_java_vframe(RegisterMap*)+0xfa
Summary: Add a safe guard to VMOp_GetCurrentLocation against non-walkable stack of target thread exiting from Java execution
Reviewed-by: mgronlun, dholmes, sla, dcubed
Contributed-by: serguei.spitsyn@oracle.com

Reviewed-by: kvn, iveresov

Reviewed-by: coleenp, ehelin, egahlin, mgronlun