[test] XFAIL crashing Sema test

Author: milseman

test/Sema/fixed_ambiguities/rdar35623181.swift

@@ -1,6 +1,8 @@
-
 // RUN: %target-swift-frontend -emit-sil -verify %s | %FileCheck %s
 
+// XFAIL: *
+// ^ SR-7673
+
 extension Sequence where Element == String {
   func record() -> String {
     // CHECK: function_ref @$Ss20LazySequenceProtocolPsE3mapys0a3MapB0Vy8ElementsQzqd__Gqd__7ElementQzclF : $@convention(method) <τ_0_0 where τ_0_0 : LazySequenceProtocol><τ_1_0> (@guaranteed @callee_guaranteed (@in_guaranteed τ_0_0.Element) -> @out τ_1_0, @in_guaranteed τ_0_0) -> @out LazyMapSequence<τ_0_0.Elements, τ_1_0