Summary: A few locations in the code use sizeof(this) which returns the size of the pointer instead of sizeof(classname) which returns the size of the sum of its members. This change fixes these errors and adds a few tests.
Reviewed-by: mgerdin, brutisso

Summary: temporarily disable the shutdown of the concurrent GC threads introduced in JDK-8037112
Reviewed-by: brutisso, tschatzl, jmasa

Reviewed-by: tschatzl, jmasa

Summary: Card re-dirtying code for verification and actual redirtying uses two different, almost completely identical card closures. Also the verification code still assumes a perm gen.
Reviewed-by: brutisso, jmasa

Summary: Parallelize card redirtying to decrease the time it takes.
Reviewed-by: brutisso

Summary: G1 does not retire allocation buffers after reference processing work when -XX:+ParallelRefProcEnabled is enabled. This causes wrong calculation of PLAB sizes, as the amount of space wasted is not updated correctly.
Reviewed-by: brutisso

Summary: The mentioned method is never used and out of date. So it is removed.
Reviewed-by: mgerdin, brutisso

Summary: After changes to the PerRegionTable where all these PRTs are linked together in an additional field, simplify iterating over all PRTs by using these links instead of walki
Reviewed-by: mgerdin, jwilhelm, brutisso

Summary: Instead of using a manually managed array for the in_cset_fast_test array, use a G1BiasedArray instance.
Reviewed-by: brutisso, mgerdin

8038930: G1CodeRootSet::test fails with assert(_num_chunks_handed_out == 0) failed: No elements must have been handed out yet
Summary: The test incorrectly assumed that it had been started with no other previous compilation activity. Fix this by allowing multiple code root free chunk lists, and use one separate from the global one to perform the test.
Reviewed-by: brutisso

Reviewed-by: jwilhelm, sjohanss, jmasa

8037925: CMM Testing: an allocated humongous object at the end of the heap should not prevents shrinking the heap
Summary: New test added.
Reviewed-by: ehelin, tschatzl, jwilhelm
Contributed-by: andrey.x.zakharov@oracle.com