Merge pull request #36979 from CodaFi/windham

Un-XFAIL a Passing Test on Windows

Author: shahmishal

test/Interop/Cxx/class/extensions-irgen.swift

@@ -1,7 +1,4 @@
 // RUN: %target-swift-emit-ir %s -I %S/Inputs -enable-cxx-interop | %FileCheck %s
-//
-// We can't yet call member functions correctly on Windows (SR-13129).
-// XFAIL: OS=windows-msvc
 
 import Extensions