[test] XFAIL local-vars.swift.gyb on Windows

Author: JDevlieghere

test/DebugInfo/local-vars.swift.gyb

@@ -2,6 +2,9 @@
 // test only verifies that the variables show up in the debug info at
 // all. There are other tests testing liveness and representation.
 
+// rdar://problem/57611302
+// XFAIL: windows
+
 // RUN: %gyb %s -o %t.swift
 // RUN: %target-swift-frontend %t.swift -g -emit-ir -o - | %FileCheck %t.swift
 // RUN: %target-swift-frontend %t.swift -g -c -o %t.o