XFAIL tests now failing under noncopyable_generics

After implementing mangling for inverses, issues have been revealed.

Author: kavon

test/IRGen/existential_shape_metadata.swift

@@ -1,5 +1,7 @@
 // RUN: %target-swift-frontend -emit-ir %s -swift-version 5 -disable-availability-checking | %IRGenFileCheck %s
 
+// XFAIL: noncopyable_generics
+
 // CHECK-LABEL: @"$sl26existential_shape_metadata2Q0_px1TRts_XPXGMq" = linkonce_odr hidden constant
 // CHECK-SAME:  { i32 {{.*}}sub ([[INT]] ptrtoint (ptr @{{[0-9]+}} to [[INT]])
 // CHECK-SAME:    i32 6400,

test/SILGen/existential_member_accesses_self_assoctype.swift

@@ -1,5 +1,7 @@
 // RUN: %target-swift-frontend -emit-silgen %s | %FileCheck %s
 
+// XFAIL: noncopyable_generics
+
 protocol P {
   associatedtype A
 

test/SILGen/tuple_attribute_reabstraction.swift

@@ -1,5 +1,7 @@
 // RUN: %target-swift-emit-silgen %s | %FileCheck %s
 
+// XFAIL: noncopyable_generics
+
 public struct G<T> {
   var t: T
 

test/SILGen/variadic-generic-reabstract-tuple-result.swift

@@ -1,5 +1,7 @@
 // RUN: %target-swift-emit-silgen -disable-availability-checking %s | %FileCheck %s
 
+// XFAIL: noncopyable_generics
+
 // rdar://110391963
 
 struct Use<each T> {}