RFR: JDK-8169177 Aarch64: SIGSEGV when "-XX:+ZeroTLAB" is specified along with GC options

[Kavitha Natarajan]

Hi,

The following are the jtreg test cases that fail with SIGSEGV on aarch64
when "-XX:+ZeroTLAB" is specified along with GC options:

hotspot/test/compiler/stringopts/TestStringObjectInitialization.java
hotspot/test/gc/TestSystemGC.java
hotspot/test/gc/arguments/TestAlignmentToUseLargePages.java
hotspot/test/gc/cms/TestBubbleUpRef.java
hotspot/test/gc/metaspace/TestMetaspacePerfCounters.java
hotspot/test/gc/parallel/TestDynShrinkHeap.java
hotspot/test/gc/stress/TestGCOld.java

Bug fix for JDK-8086053
<https://bugs.openjdk.java.net/browse/JDK-8086053> (Address
inconsistencies regarding ZeroTLAB) fixes similar issue on x86 and sparc.
This is now ported to aarch64 and the above test cases now pass on aarch64
as well.

Below is the webrev for the changes:

http://people.linaro.org/~kavitha.natarajan/8169177/webrev.00/

Can someone please review ?

Thanks,
Kavitha
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