v8: patch API to be compatible with v8 6.0
This is an extension of #12875 which takes into account more recent V8 API changes on the 6.0 branch. V8 6.0 should not have any more API changes, so this should be the final piece to make the Node 8.x branch API compatible with V8 6.0.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
@addaleax @MylesBorins
Affected core subsystem(s)
deps/v8