[embedded] Fix IR verification crash when using arrays of zero-sized structs

test/embedded/array-zero-size-struct.swift

@@ -0,0 +1,21 @@
+// RUN: %target-swift-frontend -emit-ir %s -enable-experimental-feature Embedded | %FileCheck %s
+
+// REQUIRES: VENDOR=apple
+// REQUIRES: OS=macosx
+
+public struct MyStruct {
+}
+
+public func main() {
+  var arr: [MyStruct] = []
+  var arr2: [MyStruct] = [.init()]
+  var arr3 = arr2
+  arr3.append(MyStruct())
+}
+
+public func copy(_ a: inout [MyStruct]) {
+  var a = a
+}
+
+// CHECK: define {{.*}}@"$s4mainAAyyF"
+// CHECK: define {{.*}}@"$s4main4copyyySayAA8MyStructVGzF"