Use Cell::take in a couple places

src/test/run-make/wasm-panic-small/foo.rs

@@ -23,5 +23,5 @@ pub fn foo() {
 pub fn foo() -> usize {
     use std::cell::Cell;
     thread_local!(static A: Cell<Vec<u32>> = Cell::new(Vec::new()));
-    A.try_with(|x| x.replace(Vec::new()).len()).unwrap_or(0)
+    A.try_with(|x| x.take().len()).unwrap_or(0)
 }

src/test/ui/traits/negative-impls/pin-unsound-issue-66544-clone.rs

@@ -7,7 +7,7 @@ struct MyType<'a>(Cell<Option<&'a mut MyType<'a>>>, PhantomPinned);
 impl<'a> Clone for &'a mut MyType<'a> {
     //~^ ERROR E0751
     fn clone(&self) -> &'a mut MyType<'a> {
-        self.0.replace(None).unwrap()
+        self.0.take().unwrap()
     }
 }
 

src/test/ui/traits/negative-impls/pin-unsound-issue-66544-derefmut.rs

@@ -12,7 +12,7 @@ struct MyType<'a>(Cell<Option<&'a mut MyType<'a>>>, PhantomPinned);
 impl<'a> DerefMut for &'a MyType<'a> {
     //~^ ERROR E0751
     fn deref_mut(&mut self) -> &mut MyType<'a> {
-        self.0.replace(None).unwrap()
+        self.0.take().unwrap()
     }
 }