[addr-move-function] Add some simple defer tests for lets. We always error on these.

To improve the diagnostics though I think I am going to have to add a closure
operand analysis to copyable values like I did for copyable addresses...

Author: gottesmm

test/SILOptimizer/move_function_kills_copyable_addressonly_lets.swift

@@ -389,3 +389,16 @@ public func partialApplyTest<T>(_ x: __owned T) { // expected-error {{'x' used a
     }
     f()
 }
+
+/////////////////
+// Defer Tests //
+/////////////////
+
+// TODO: Emit an error in the defer.
+public func deferTest<T>(_ x: __owned T) { // expected-error {{'x' used after being moved}}
+    let _ = _move(x) // expected-note {{move here}}
+    defer { // expected-note {{use here}}
+        nonConsumingUse(x)
+    }
+    print("do Something")
+}

test/SILOptimizer/move_function_kills_copyable_values.swift

@@ -363,3 +363,19 @@ public func partialApplyTest(_ x: __owned Klass) { // expected-error {{'x' used
     }
     f()
 }
+
+/////////////////
+// Defer Tests //
+/////////////////
+
+// TODO: Improve this error msg.
+//
+// NOTE: This will require adding knowledge about captured defer arguments for
+// values. This at least prevents the error from happening.
+public func deferTest(_ x: __owned Klass) { // expected-error {{'x' used after being moved}}
+    let _ = _move(x) // expected-note {{move here}}
+    defer { // expected-note {{use here}}
+        nonConsumingUse(x)
+    }
+    print("do Something")
+}