[clang] [IRPGO][ValueProfile] Instrument virtual table address that could be used to do virtual table address comparision for indirect-call-promotion. (PR #66825)

[David Li via cfe-commits]

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@@ -272,18 +279,26 @@ lprofWriteDataImpl(ProfDataWriter *Writer, const __llvm_profile_data *DataBegin,
   const uint64_t NumCounters =
       __llvm_profile_get_num_counters(CountersBegin, CountersEnd);
   const uint64_t NamesSize = DebugInfoCorrelate ? 0 : NamesEnd - NamesBegin;
+  const uint64_t NumVTables =
+      __llvm_profile_get_num_vtable(VTableBegin, VTableEnd);
+  const uint64_t VTableSectionSize =
+      __llvm_profile_get_vtable_size(VTableBegin, VTableEnd);
+  // Note, in reality, vtable profiling is not supported when DebugInfoCorrelate
+  // is true.
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david-xl wrote:

just documenting "vtable profiling is yet supported when ...."

https://github.com/llvm/llvm-project/pull/66825