RFR(M) 8138895: C1: PPC64 Port needs special register for Locks in synchronization code

[Doerr, Martin]

Hi,


This change introduces syncLockOpr like the existing syncTempOpr. Other platforms than PPC64 just return a new register so it's no functional change there.

This change is a prerequisite for our C1 on PPC64 contribution.



Webrev is here:

http://cr.openjdk.java.net/~mdoerr/8138895_c1_syncLockOpr/webrev.00



Implementation for aarch64 is included but not tested.



Please review this change.  I need a sponsor, please.


Best regards,
  Martin

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