[test] Disable conformance_descriptors.swift on arm64e

rdar://88579818

Author: hamishknight

test/Reflection/conformance_descriptors.swift

@@ -1,5 +1,11 @@
 // UNSUPPORTED: windows
+
+// Temporarily disable on AArch64 Linux (rdar://88451721)
 // UNSUPPORTED: OS=linux-gnu && CPU=aarch64
+
+// Temporarily disable on arm64e (rdar://88579818)
+// UNSUPPORTED: CPU=arm64e
+
 // RUN: %empty-directory(%t)
 
 // RUN: %target-build-swift -Xfrontend -enable-anonymous-context-mangled-names %S/Inputs/ConcreteTypes.swift %S/Inputs/GenericTypes.swift %S/Inputs/Protocols.swift %S/Inputs/Extensions.swift %S/Inputs/Closures.swift %S/Inputs/Conformances.swift -parse-as-library -emit-module -emit-library -module-name ConformanceCheck -o %t/Conformances