More inference-friendly API for lazy

The signature for new was

```
fn new<F>(f: F) -> Lazy<T, F>
```

Notably, with `F` unconstrained, `T` can be literally anything, and just
`let _ = Lazy::new(|| 92)` would not typecheck.

This historiacally was a necessity -- `new` is a `const` function, it
couldn't have any bounds. Today though, we can move `new` under the `F:
FnOnce() -> T` bound, which gives the compiler enough data to infer the
type of T from closure.

library/core/src/cell/lazy.rs

@@ -31,7 +31,7 @@ pub struct LazyCell<T, F = fn() -> T> {
  init: Cell<Option<F>>,
 }
 
-impl<T, F> LazyCell<T, F> {
+impl<T, F: FnOnce() -> T> LazyCell<T, F> {
  /// Creates a new lazy value with the given initializing function.
  ///
  /// # Examples
@@ -51,9 +51,7 @@ impl<T, F> LazyCell<T, F> {
  pub const fn new(init: F) -> LazyCell<T, F> {
  LazyCell { cell: OnceCell::new(), init: Cell::new(Some(init)) }
  }
-}
 
-impl<T, F: FnOnce() -> T> LazyCell<T, F> {
  /// Forces the evaluation of this lazy value and returns a reference to
  /// the result.
  ///

library/core/tests/lazy.rs

@@ -106,6 +106,12 @@ fn lazy_new() {
  assert_eq!(called.get(), 1);
 }
 
+// Check that we can infer `T` from closure's type.
+#[test]
+fn lazy_type_inference() {
+ let _ = LazyCell::new(|| ());
+}
+
 #[test]
 fn aliasing_in_get() {
  let x = OnceCell::new();

library/std/src/sync/lazy_lock.rs

@@ -44,17 +44,14 @@ pub struct LazyLock<T, F = fn() -> T> {
  cell: OnceLock<T>,
  init: Cell<Option<F>>,
 }
-
-impl<T, F> LazyLock<T, F> {
+impl<T, F: FnOnce() -> T> LazyLock<T, F> {
  /// Creates a new lazy value with the given initializing
  /// function.
  #[unstable(feature = "once_cell", issue = "74465")]
  pub const fn new(f: F) -> LazyLock<T, F> {
  LazyLock { cell: OnceLock::new(), init: Cell::new(Some(f)) }
  }
-}
 
-impl<T, F: FnOnce() -> T> LazyLock<T, F> {
  /// Forces the evaluation of this lazy value and
  /// returns a reference to result. This is equivalent
  /// to the `Deref` impl, but is explicit.

library/std/src/sync/lazy_lock/tests.rs

@@ -136,6 +136,12 @@ fn sync_lazy_poisoning() {
  }
 }
 
+// Check that we can infer `T` from closure's type.
+#[test]
+fn lazy_type_inference() {
+ let _ = LazyCell::new(|| ());
+}
+
 #[test]
 fn is_sync_send() {
  fn assert_traits<T: Send + Sync>() {}