Add const eval tests ensuring padding gets correctly marked as deinit on deaggregation

src/test/ui/consts/const-eval/ub-enum-overwrite.rs

@@ -0,0 +1,17 @@
+#![feature(const_mut_refs)]
+
+enum E {
+    A(u8),
+    B,
+}
+
+const _: u8 = {
+    //~^ ERROR is undefined behavior
+    let mut e = E::A(1);
+    let p = if let E::A(x) = &mut e { x as *mut u8 } else { unreachable!() };
+    // Make sure overwriting `e` uninitializes other bytes
+    e = E::B;
+    unsafe { *p }
+};
+
+fn main() {}

src/test/ui/consts/const-eval/ub-enum-overwrite.stderr

@@ -0,0 +1,20 @@
+error[E0080]: it is undefined behavior to use this value
+  --> $DIR/ub-enum-overwrite.rs:8:1
+   |
+LL | / const _: u8 = {
+LL | |
+LL | |     let mut e = E::A(1);
+LL | |     let p = if let E::A(x) = &mut e { x as *mut u8 } else { unreachable!() };
+...  |
+LL | |     unsafe { *p }
+LL | | };
+   | |__^ type validation failed: encountered uninitialized bytes, but expected initialized plain (non-pointer) bytes
+   |
+   = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
+   = note: the raw bytes of the constant (size: 1, align: 1) {
+               __                                              │ ░
+           }
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0080`.