[llvm] [XCOFF][OBJECT] get symbol size by calling XCOFF interfaces (PR #67304)

[via llvm-commits]

================
@@ -822,11 +833,29 @@ class XCOFFSymbolRef {
   Expected<XCOFFCsectAuxRef> getXCOFFCsectAuxRef() const;
 
 private:
-  const XCOFFObjectFile *OwningObjectPtr;
+  const XCOFFObjectFile *getObject() const {
+    return cast<XCOFFObjectFile>(BasicSymbolRef::getObject());
+  }
+
   const XCOFFSymbolEntry32 *Entry32 = nullptr;
   const XCOFFSymbolEntry64 *Entry64 = nullptr;
 };
 
+class xcoff_symbol_iterator : public symbol_iterator {
+public:
+  xcoff_symbol_iterator(const basic_symbol_iterator &B)
+      : symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
+                                  cast<XCOFFObjectFile>(B->getObject()))) {}
----------------
diggerlin wrote:



change 

```
symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
                                  cast<XCOFFObjectFile>(B->getObject())))
```
 -->
` symbol_iterator(B) `

https://github.com/llvm/llvm-project/pull/67304