RFR(M): 8146613: PPC64: C2 does no longer respect int to long conversion for stub calls

[Doerr, Martin]

Hi,

I have created a webrev which introduces int to long conversion in PPC64 functions which are called by C2 runtime calls.
I also added assertions to arraycopy stubs which are already called correctly.

Background:
8086069 removed too much code. Only the native wrapper performed the conversion after this change. However, it is required to convert ints to longs for all C calls and some runtime calls.
8144466 reintroduced the platform variable CCallingConventionRequiresIntsAsLongs and the conversion for the runtime calls for which C2 calls shared C functions on PPC64.
Some PPC64 runtime functions which rely on proper 64 bit arguments are still called without conversion.

Webrev is here:
http://cr.openjdk.java.net/~mdoerr/8146613_ppc64_int2long/webrev.00/

It only touches PPC64 files.

Please review and sponsor.

Best regards,
Martin

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