[Clang] Emit type metadata on vtables when IRPGO instrumentation option is on. (#70841)
The motivating use case is to have type metadata on vtables if IR instrumentation is on (without the requirement of`-fwhole-program-vtables` or `-flto`). A related rfc is in https://discourse.llvm.org/t/rfc-dynamic-type-profiling-and-optimizations-in-llvm/74600
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