Summary: add support for opto object allocations sampling

Test Plan: test/jdk/jdk/jfr/event/objectsprofiling/TestOptoObjectAllocationsSampling.java

Reviewers: kuaiwei, luchsh, sanhong

Issue: #7

Summary:
ported from Dragonwell 8, added new flag ArrayAllocationWarningSize
to warn allocation of large arrays

Test Plan: test/hotspot/jtreg/runtime/memory

Reviewed-by: kuaiwei

Issue: #3

Summary: port mini-heapdump feature to Dragonwell 11

Test Plan: test/jdk/tools, test/hotspot/serviceability

Reviewed-by: kuaiwei

Issue: #5

Summary: Ported from Dragonwell 8

Test Plan: build and sanity test

Reviewed-by: kuaiwei

Issue: #1

Reviewed-by: kvn, rhalade, mschoene

Reviewed-by: aph, dholmes
Contributed-by: NAndrey Petushkov <andrey.petushkov@gmail.com>

Reviewed-by: adinn

8216989: CardTableBarrierSetAssembler::gen_write_ref_array_post_barrier() does not check for zero length on AARCH64
Reviewed-by: adinn

Reviewed-by: kbarrett, mikael

--HG--
extra : rebase_source : fb25bf4481c0c90ab82cbc0a1857e6419444e102

Reviewed-by: kbarrett, rehn

--HG--
extra : rebase_source : d5ad580bc76e85e580d173b1bba9da30da45b11c

Reviewed-by: kvn, iignatyev
Contributed-by: xxinliu@amazon.com

Reviewed-by: dholmes, rrich

Reviewed-by: dholmes, mdoerr

Reviewed-by: adinn, dsamersoff

Reviewed-by: mdoerr, shade

Reviewed-by: dholmes, mdoerr, clanger

8210389: C2: assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
Reviewed-by: kvn, thartmann

Reviewed-by: dlong, shade
Contributed-by: christoph.goettschkes@microdoc.com

Reviewed-by: aph, drwhite

Reviewed-by: aph

Reviewed-by: aph

Reviewed-by: thartmann, sspitsyn

--HG--
extra : rebase_source : 19d36d4fa6c83bfacbfbdc627afc93e719f7db5b

8224658: Unsafe access C2 compile fails with assert(flat != TypePtr::BOTTOM) failed: cannot alias-analyze an untyped ptr: adr_type = NULL
Summary: Handle unsafe off-heap access with constant zero address.
Reviewed-by: vlivanov, roland

Reviewed-by: thartmann

Reviewed-by: dsamersoff

Reviewed-by: adinn, thartmann

8211233: MemBarNode::trailing_membar() and MemBarNode::leading_membar() need to handle dying subgraphs better
Reviewed-by: kvn, thartmann

Reviewed-by: adinn, aph, thartmann

Reviewed-by: kvn

Reviewed-by: pliden, eosterlund
Contributed-by: albert.th@alibaba-inc.com

Reviewed-by: goetz, mbaesken

Summary: Make frame layout consistent between dbg and product build and implement offsets accordingly.
Reviewed-by: goetz, gromero

Reviewed-by: hseigel

Reviewed-by: adinn

8210390: C2 still crashes with "assert(mode == ControlAroundStripMined && use == sfpt) failed: missed a node"
Reviewed-by: thartmann, kvn

Reviewed-by: vlivanov, bsrbnd
Contributed-by: fujie@loongson.cn, bsrbnd@gmail.com

Reviewed-by: kvn

Reviewed-by: dholmes, rehn

Reviewed-by: kvn, thartmann

Reviewed-by: kvn