Add ~Escapable _read accessor test.

Author: atrick

test/SILGen/accessor_borrow.swift

@@ -1,12 +1,22 @@
-// RUN: %target-swift-emit-silgen -module-name accessor_borrow -Xllvm -sil-full-demangle %s | %FileCheck %s
+// RUN: %target-swift-emit-silgen -module-name accessor_borrow \
+// RUN: -enable-experimental-feature LifetimeDependence \
+// RUN: %s | %FileCheck %s
+
+// REQUIRES: swift_feature_LifetimeDependence
 
 struct NE: ~Escapable {}
 
 struct NEContainer: ~Copyable {
   // This accessor borrows self. Do not synthesize a getter.
+  //
+  // Check NEContainer.ne_coroutine.read
+  // CHECK-LABEL: sil hidden [ossa] @$s15accessor_borrow11NEContainerV12ne_coroutineAA2NEVvr : $@yield_once @convention(method) (@guaranteed NEContainer) -> @lifetime(borrow 0) @yields @guaranteed NE {
+  //
+  // Do not synthesize NEContainer.ne_coroutine.getter
+  // CHECK-NOT: $s15accessor_borrow11NEContainerV12ne_coroutineAA2NEVvg
   var ne_coroutine: NE {
     _read {
-      NE()
+      yield NE()
     }
   }
 }