third_party: ngen: restore PVC WAR bug workaround #4429
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Port of #4423 + regression test.
The regression test covers two cases from MFDNN-14449 and MFDNN-13404. It's not super-straightforward though:
set_tests_properties+PROPERTIES ENVIRONMENTto trigger the bugf64and PVC so I added an internal interface for GPU ISA query to target PVC only:dnnl_impl_gpu_intel_get_isa_name()