RFR(XS): PPC64: vtableStubs gtest fails after 8174962

[Doerr, Martin]

Hi,

we noticed that PPC64 has the same problem as aarch64 (8195859: AArch64: vtableStubs gtest fails after 8174962).

I have cloned the bug and created a webrev. Please review:
http://cr.openjdk.java.net/~mdoerr/8196503_ppc64_large_vtable/webrev.00/

The RegisterOrConstant version of ld will consume up to 8 bytes of additional space for int range. This still fits into the safety size computed by VtableStub::pd_code_size_limit.

This fix should be done in jdk10.

Best regards,
Martin

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