[llvm] [Object][GOFF] Support RLD records (PR #216780)

[Sean Fertile via llvm-commits]

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@@ -759,3 +765,118 @@ basic_symbol_iterator GOFFObjectFile::symbol_end() const {
   DataRefImpl Symb;
   return basic_symbol_iterator(SymbolRef(Symb, this));
 }
+
+// Populate the relocation entries.
+void GOFFObjectFile::setRelocationData(const uint8_t *RldRecord) {
+  SmallVector<uint8_t, 8> RelocationData;
+  int DataIndex = 6;
+  uint16_t DataLength;
+  RLDRecord::getDataLength(RldRecord, DataLength);
+  Expected<unsigned> BlocksConsumed =
+      getContinuousData(RelocationData, DataIndex, DataLength, RldRecord);
+  if (!BlocksConsumed)
+    llvm::handleAllErrors(BlocksConsumed.takeError(),
+                          [](const llvm::ErrorInfoBase &EIB) {
+                            llvm::errs() << "ERROR: " << EIB.message() << "\n";
+                          });
+  assert(static_cast<size_t>(DataLength + DataIndex) == RelocationData.size() &&
+         "Inconsistent rld size");
+
+  uint8_t *RldI = reinterpret_cast<uint8_t *>(RelocationData.data());
+  uint8_t *RldE = RldI + RelocationData.size();
+  for (uint8_t *Rld = RldI + DataIndex; Rld < RldE;) {
+    GOFFRelEntry RelEntry;
+    uint8_t Flags = Rld[0];
+
+#define SAME_R_ID 0x80
----------------
mandlebug wrote:

```suggestion
inline constexpr uint8_t SAME_R_ID = 0x80
```

At the top of the file instead

https://github.com/llvm/llvm-project/pull/216780