Add a source-level optimizer test for addressable dependencies.

(cherry picked from commit 5914369)

Author: atrick

test/SILOptimizer/addressable_dependency_optimization.swift

@@ -0,0 +1,24 @@
+// RUN: %target-swift-frontend -emit-sil -parse-as-library -O -module-name=test \
+// RUN:   -enable-experimental-feature LifetimeDependence \
+// RUN:   -enable-experimental-feature AddressableTypes \
+// RUN:   %s | %FileCheck %s
+
+// REQUIRES: swift_feature_AddressableTypes
+// REQUIRES: swift_feature_LifetimeDependence
+
+// Enable this test as soon as CollectionOfOne is marked @_addressableForDependencies.
+// REQUIRES: rdar145687827
+
+// CHECK-LABEL: sil {{.*}}@$s4test0A10OneIntSpan1cs0D0VySiGs012CollectionOfB0VySiG_tF : $@convention(thin) (@in_guaranteed CollectionOfOne<Int>) -> @lifetime(borrow address_for_deps 0) @owned Span<Int> {
+// CHECK: bb0(%0 : $*CollectionOfOne<Int>):
+// CHECK:   [[RP:%.*]] = address_to_pointer {{.*}}%0 to $Builtin.RawPointer
+// CHECK:   [[UP:%.*]] = struct $UnsafeRawPointer ([[RP]])
+// CHECK:   [[OP:%.*]] = enum $Optional<UnsafeRawPointer>, #Optional.some!enumelt, [[UP]]
+// CHECK:   [[SPAN:%.*]] = struct $Span<Int> ([[OP]]
+// CHECK:   return [[SPAN]]
+// CHECK-LABEL: } // end sil function '$s4test0A10OneIntSpan1cs0D0VySiGs012CollectionOfB0VySiG_tF'
+@available(SwiftStdlib 6.2, *)
+@lifetime(borrow c)
+public func testOneIntSpan(c: CollectionOfOne<Int>) -> Span<Int> {
+  c.span
+}