ICE because uninhabited types and drop flags don't mix

Reference rust-lang/rust#17987

Author: Bruno Tavares

src/17987.rs

@@ -0,0 +1,8 @@
+enum Foo {}
+impl Drop for Foo {
+    fn drop(&mut self) {}
+}
+
+fn main() {
+    unsafe { std::ptr::read(&1u8 as *const u8 as *const Foo) };
+}