[NFC] Remote TODO regarding opaque ptr conversion

Author: pmatos

llvm/include/llvm/IR/Type.h

@@ -482,9 +482,6 @@ class Type {
   //===--------------------------------------------------------------------===//
   // Convenience methods for getting pointer types.
   //
-
-  // TODO: After opaque pointer transition this can be replaced by simply
-  //       calling PointerType::get(C, AS).
   static PointerType *getInt8PtrTy(LLVMContext &C, unsigned AS = 0);
 
   static Type *getWasm_ExternrefTy(LLVMContext &C);