Fix crashes on Linux/PPC64 ELFv1
Instead of using "defined(_AIX)" or "V8_OS_AIX" as a test for when to use function descriptors, use "ABI_USES_FUNCTION_DESCRIPTORS" which exists precisely for this purpose. This fixes the crashes on Linux/ppc64 ELFv1.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
deps: V8: fix tests for function descriptors on PPC64