[llvm] [BOLT][DWARF] Add support for DW_IDX_parent (PR #85285)

[Maksim Panchenko via llvm-commits]

================
@@ -456,6 +483,17 @@ void DWARF5AcceleratorTable::writeEntry(const BOLTDWARF5AccelTableData &Entry) {
                              llvm::endianness::little);
       break;
     }
+    case dwarf::DW_IDX_parent: {
+      assert(
+          (AttrEnc.Form == dwarf::DW_FORM_ref4 && Entry.getParentDieOffset()) ||
+          AttrEnc.Form == dwarf::DW_FORM_flag_present);
+      if (std::optional<uint64_t> ParentOffset = Entry.getParentDieOffset()) {
+        Entry.setPatchOffset(EntriesBuffer->size());
+        support::endian::write(*Entriestream, static_cast<uint32_t>(0xBADF00D),
----------------
maksfb wrote:

Sure if that's what DWARF spec recommends.

https://github.com/llvm/llvm-project/pull/85285