[Test] Add a test case

Author: theblixguy

validation-test/compiler_crashers_2_fixed/sr10492.swift

@@ -0,0 +1,8 @@
+// RUN: not %target-swift-frontend -emit-silgen %s
+
+struct S {
+  func foo() -> Int! { return 0 }
+}
+
+let s = S()
+let x: Int = (s.foo)()