C1 for PPC64 contribution

[Doerr, Martin]

Hi,

SAP has ported the C1 compiler to PPC64.  To contribute it, we require to do
some minor shared changes to C1.  Some are bugfixes, others minor adaptions
to support PPC64 specialities.  We will send out RFRs for the following changes
step by step:
http://cr.openjdk.java.net/~mdoerr/8138890_c1_ambiguous_delete
http://cr.openjdk.java.net/~mdoerr/8138891_c1_cms_membar
http://cr.openjdk.java.net/~mdoerr/8138892_c1_counter_overflow
http://cr.openjdk.java.net/~mdoerr/8138894_c1_IRIW
http://cr.openjdk.java.net/~mdoerr/8138895_c1_syncLockOpr
http://cr.openjdk.java.net/~mdoerr/8138896_c1_patching_fix
http://cr.openjdk.java.net/~mdoerr/8138952_c1_PPC64_defs

After this, we will contribute the changes to the ppc files in one blob.

We would appreciate your help in reviewing and especially sponsoring!

Best regards,
Martin

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