Rollup merge of #77360 - oli-obk:zst_const_pat_regression, r=RalfJung

References to ZSTs may be at arbitrary aligned addresses

fixes #77320

r? @RalfJung

src/test/ui/match/const_non_normal_zst_ref_pattern.rs

@@ -0,0 +1,9 @@
+// check-pass
+
+const FOO: isize = 10;
+const ZST: &() = unsafe { std::mem::transmute(FOO) };
+fn main() {
+    match &() {
+        ZST => 9,
+    };
+}