[test] More test updates

Author: lorentey

test/Interop/Cxx/class/move-only/move-only-cxx-value-type.swift

@@ -4,9 +4,6 @@
 //
 // REQUIRES: executable_test
 
-// Needs an UnsafeMutablePointer where Pointee: ~Copyable (rdar://124544696)
-// XFAIL: *
-
 import MoveOnlyCxxValueType
 import StdlibUnittest
 

validation-test/SILOptimizer/rdar114699006.swift

@@ -9,6 +9,8 @@
 // RUN:     -Xllvm -sil-print-function='$s4main1CCACycfc' \
 // RUN:     2>&1 | %FileCheck %s
 
+// REQUIRES: CPU=x86_64
+
 // This test expects the stdlib to be in its properly optimized form.
 // REQUIRES: swift_stdlib_no_asserts,optimized_stdlib