[llvm] [z/OS][GOFF] Implement support for writing ESD + TXT records by the GOFFObjectWriter (PR #85851)

[Ulrich Weigand via llvm-commits]

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@@ -18,10 +18,63 @@
 namespace llvm {
 
 class MCSymbolGOFF : public MCSymbol {
+  Align Alignment;
+
+  mutable StringRef AliasName; // ADA indirect
+
+  enum SymbolFlags : uint16_t {
+    SF_NoRent = 0x01,    // Symbol is no-reentrant.
+    SF_Alias = 0x02,     // Symbol is alias.
+    SF_Hidden = 0x04,    // Symbol is hidden, aka not exported.
+    SF_Weak = 0x08,      // Symbol is weak.
+    SF_OSLinkage = 0x10, // Symbol uses OS linkage.
+  };
+
+  // Shift value for GOFF::ESDExecutable. 3 possible values. 2 bits.
+  static constexpr uint8_t GOFF_Executable_Shift = 6;
+  static constexpr uint8_t GOFF_Executable_Bitmask = 0x03;
+
 public:
   MCSymbolGOFF(const StringMapEntry<bool> *Name, bool IsTemporary)
-      : MCSymbol(SymbolKindGOFF, Name, IsTemporary) {}
+      : MCSymbol(SymbolKindGOFF, Name, IsTemporary), AliasName() {}
   static bool classof(const MCSymbol *S) { return S->isGOFF(); }
+
+  bool hasAliasName() const { return !AliasName.empty(); }
+  void setAliasName(StringRef Name) { AliasName = Name; }
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uweigand wrote:

Nothing ever calls this.

https://github.com/llvm/llvm-project/pull/85851