Disable pre ossa modules tests

Author: meg-gupta

test/ModuleInterface/ossa-modules/different-modes-have-different-hashes.swift

@@ -162,6 +162,7 @@
 // RUN: cd %t/MCP.O && ls *.swiftmodule > %t/MCP.O/firstFile
 // RUN: cd %t/MCP.O/old && ls *.swiftmodule > %t/MCP.O/secondFile
 // RUN: not diff -u %t/MCP.O/firstFile %t/MCP.O/secondFile
+// XFAIL: *
 
 @_fixed_layout
 public final class Klass {

test/ModuleInterface/ossa-modules/sdk-test-stdlib-no-ossa.swift

@@ -28,6 +28,7 @@
 // Make sure the rebuild is in OSSA.
 
 // RUN: %target-sil-opt -module-name Swift %t/PreBuiltSDKModules/Swift.swiftmodule/*.swiftmodule | grep '@$ss3foos5KlassCyF' | grep '[[]ossa[]]'
+// XFAIL: *
 
 @_fixed_layout
 public final class Klass {