Remove diagnostic which didnt allow explicitly specifying BitwiseCopyable on a ~Escapable type

Author: meg-gupta

include/swift/AST/DiagnosticsSema.def

@@ -7653,8 +7653,6 @@ NOTE(note_non_bitwise_copyable_type_indirect_enum_element,none,
      "indirect case is here", ())
 ERROR(non_bitwise_copyable_type_noncopyable,none,
       "noncopyable type cannot conform to 'BitwiseCopyable'", ())
-ERROR(non_bitwise_copyable_type_nonescapable,none,
-      "nonescapable type cannot conform to 'BitwiseCopyable'", ())
 ERROR(non_bitwise_copyable_type_cxx_nontrivial,none,
       "non-trivial C++ type cannot conform to 'BitwiseCopyable'", ())
 ERROR(non_bitwise_copyable_c_type_nontrivial,none,

lib/Sema/TypeCheckBitwise.cpp

@@ -239,13 +239,6 @@ static bool checkBitwiseCopyableInstanceStorage(NominalTypeDecl *nominal,
     return true;
   }
 
-  if (!dc->mapTypeIntoContext(nominal->getDeclaredInterfaceType())->isEscapable()) {
-    if (!isImplicit(check)) {
-      nominal->diagnose(diag::non_bitwise_copyable_type_nonescapable);
-    }
-    return true;
-  }
-
   if (isa<ClassDecl>(nominal)) {
     if (!isImplicit(check)) {
       nominal->diagnose(diag::non_bitwise_copyable_type_class);