Add reduced test case for rdar://problem/54926602.

Author: varungandhi-apple

validation-test/Sema/type_checker_perf/slow/rdar54926602.swift

@@ -0,0 +1,15 @@
+// FIXME: We shouldn't be consuming a lot of memory here but we do.
+// RUN: %scale-test --begin 1 --end 4 --step 1 --select NumLeafScopes %s --expected-exit-code 1 --invert-result
+// REQUIRES: OS=macosx
+// REQUIRES: asserts
+
+class God {
+  public func isEqual(_ other: God) -> Bool {
+    return (
+	(self.form == other.form)
+%for i in range(1, N):
+        && (self.form == other.form)
+%end
+      )
+  }
+}