[aarch64-port-dev ] RFR: 8079564: aarch64: Use FP register as proper frame pointer

[Edward Nevill]

Hi,

The following webrev adds support for the -XX:+PreserveFramePointer option.

http://cr.openjdk.java.net/~enevill/8079564/webrev.00/

Support for proper frame pointers for use in debug/profile was added to x86 in the following changeset

http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/382e9e4b3b71

This webrev mirrors that changeset to add the support to aarch64.

Associated JIRA issue is

https://bugs.openjdk.java.net/browse/JDK-8079564

Tested with JTreg hotspot and langtools.

Without frame pointer (-XX:-PreserverFramePointer) which is the default

Hotspot: passed: 805; failed: 34; error: 3
Langtools: passed: 3,267; error: 9

With frame pointer (-XX:+PreserveFramePointer)

Hotspot: passed: 805; failed: 34; error: 3
Langtools: passed: 3,266; error: 10

Thanks for the review!
Ed.