Rollup merge of #102862 - scottmcm:more-alignment-traits, r=thomcc

From<Alignment> for usize & NonZeroUsize

Since you mentioned these two in rust-lang/rust#102072 (comment),
r? ``@thomcc``

Tracking Issue: rust-lang/rust#102070

Author: JohnTitor

core/src/ptr/alignment.rs

@@ -146,6 +146,22 @@ impl TryFrom<usize> for Alignment {
     }
 }
 
+#[unstable(feature = "ptr_alignment_type", issue = "102070")]
+impl From<Alignment> for NonZeroUsize {
+    #[inline]
+    fn from(align: Alignment) -> NonZeroUsize {
+        align.as_nonzero()
+    }
+}
+
+#[unstable(feature = "ptr_alignment_type", issue = "102070")]
+impl From<Alignment> for usize {
+    #[inline]
+    fn from(align: Alignment) -> usize {
+        align.as_usize()
+    }
+}
+
 #[unstable(feature = "ptr_alignment_type", issue = "102070")]
 impl cmp::Ord for Alignment {
     #[inline]