[clang] Turn 'counted_by' into a type attribute and parse it into 'CountAttributedType' (PR #78000)

[Aaron Ballman via cfe-commits]

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@@ -1117,6 +1117,32 @@ class ObjCInterfaceTypeLoc : public ConcreteTypeLoc<ObjCObjectTypeLoc,
   }
 };
 
+struct BoundsAttributedLocInfo {};
+class BoundsAttributedTypeLoc
+    : public ConcreteTypeLoc<UnqualTypeLoc, BoundsAttributedTypeLoc,
+                             BoundsAttributedType, BoundsAttributedLocInfo> {
+public:
+  TypeLoc getInnerLoc() const { return this->getInnerTypeLoc(); }
+  QualType getInnerType() const { return this->getTypePtr()->desugar(); }
+  void initializeLocal(ASTContext &Context, SourceLocation Loc) {
+    // nothing to do
+  }
+  unsigned getLocalDataAlignment() const { return 1; }
+  unsigned getLocalDataSize() const { return 0; }
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AaronBallman wrote:

Do we need to implement these at all? `ConcreteTypeLoc` should take care of that automatically I thought?

https://github.com/llvm/llvm-project/pull/78000