RFR(XXL): 8144019: PPC64 C1: Introduce Client Compiler

[Doerr, Martin]

Hi,

we would like to contribute our PPC64 port of the Client Compiler to support Tiered Compilation.
The change includes refactoring of some functionality which is shared between C1 and C2 and some updates.

The webrev is here:
http://cr.openjdk.java.net/~mdoerr/8144019_ppc64_c1/webrev.00

It only changes PPC64 files, with one minor exception: make/linux/Makefile

Please review. I will also need a sponsor, please.

Best regards,
  Martin

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