Update tests/pass/move-data-across-await-point.rs

Co-authored-by: Ralf Jung <[email protected]>

Author: bryangarza

tests/pass/move-data-across-await-point.rs

@@ -11,9 +11,10 @@ use std::future::Future;
 async fn data_moved_async() {
     async fn helper(mut data: Vec<u8>, raw_pointer: *mut Vec<u8>) {
         let raw_pointer2 = &mut data as *mut Vec<u8>;
-        // When the Vec is moved into the generator upvar, that copies the Vec's
-        // ptr+capacity+len that is on the stack. Because of that, the value of
-        // `raw_pointer2` is different than that of `raw_pointer`.
+        // `raw_pointer` points to the original location where the Vec was stored in the caller.
+        // `data` is where that Vec (to be precise, its ptr+capacity+len on-stack data)
+        // got moved to. Those will usually not be the same since the Vec got moved twice
+        // (into the function call, and then into the generator upvar).
         //
         // When copy propagation is enabled for generator upvars, the pointer
         // addresses should be equal, becouse there will no longer be a