[Test] Added opaque switch tuple test case.

Author: nate-chandler

test/SILOptimizer/opaque_values_Onone.swift

@@ -8,3 +8,28 @@
 func generic_identity<T>(t: T) -> T {
   return t
 }
+
+
+struct Outer<T : Equatable> {
+  enum Inner {
+    case outside
+    case inside(T)
+  }
+}
+
+extension Outer.Inner {
+  // CHECK-LABEL: sil hidden @outer_inner_compare
+  // CHECK: switch_enum_addr {{%[^,]+}} : $*Outer<T>.Inner, case #Outer.Inner.inside!enumelt: {{bb[0-9]+}}, case #Outer.Inner.outside!enumelt: {{bb[0-9]+}}
+  // CHECK-LABEL: } // end sil function 'outer_inner_compare'
+  @_silgen_name("outer_inner_compare")
+  static func compare(_ lhs: Outer.Inner, _ rhs: Outer.Inner) -> Bool {
+    switch (lhs, rhs) {
+    case (.inside(let l), .inside(let r)):
+      return l == r
+    case (.outside, .outside):
+      return true
+    default:
+      return false
+    }
+  }
+}