XFAIL 2 tests failing on arm64e (#36687)

Author: meg-gupta

test/IRGen/async/builtins.sil

@@ -2,6 +2,7 @@
 // RUN: %target-swift-frontend -enable-experimental-concurrency -disable-objc-interop -primary-file %s -emit-ir -sil-verify-all | %FileCheck %s -DINT=i%target-ptrsize --check-prefixes=CHECK,CHECK-native,CHECK-%target-ptrsize
 
 // REQUIRES: concurrency
+// XFAIL: CPU=arm64e
 
 sil_stage canonical
 

test/SILOptimizer/eager_specialize.sil

@@ -2,6 +2,8 @@
 // RUN: %target-sil-opt -enable-sil-verify-all -eager-specializer  %s -o %t.sil && %target-swift-frontend -module-name=eager_specialize -emit-ir %t.sil | %FileCheck --check-prefix=CHECK-IRGEN %s
 // RUN: %target-sil-opt -enable-sil-verify-all -eager-specializer -sil-inline-generics=true -inline %s | %FileCheck --check-prefix=CHECK-EAGER-SPECIALIZE-AND-GENERICS-INLINE %s
 
+// XFAIL: CPU=arm64e
+
 sil_stage canonical
 
 import Builtin