Add a codegen test to confirm this fixes 106369

Author: scottmcm

tests/codegen/issues/issue-106369.rs

@@ -0,0 +1,15 @@
+// compile-flags: -O
+// ignore-debug (the extra assertions get in the way)
+
+#![crate_type = "lib"]
+
+// From <https://github.com/rust-lang/rust/issues/106369#issuecomment-1369095304>
+
+// CHECK-LABEL: @issue_106369(
+#[no_mangle]
+pub unsafe fn issue_106369(ptr: *const &i32) -> bool {
+    // CHECK-NOT: icmp
+    // CHECK: ret i1 true
+    // CHECK-NOT: icmp
+    Some(std::ptr::read(ptr)).is_some()
+}