Remove -O from a couple type checker perf tests, and add another test.

We don't need -O here. The new test is another known failure.

Author: rudkx

validation-test/Sema/type_checker_perf_failing/array_of_tuples.swift.gyb

@@ -1,4 +1,4 @@
-// RUN: not %scale-test -O --begin 1 --end 3 --step 1 --select incrementScopeCounter %s
+// RUN: not %scale-test --begin 1 --end 3 --step 1 --select incrementScopeCounter %s
 // REQUIRES: OS=macosx
 // REQUIRES: asserts
 

validation-test/Sema/type_checker_perf_failing/nil_coalescing.swift.gyb

@@ -1,4 +1,4 @@
-// RUN: not %scale-test -O --begin 1 --end 3 --step 1 --select incrementScopeCounter %s
+// RUN: not %scale-test --begin 1 --end 3 --step 1 --select incrementScopeCounter %s
 // REQUIRES: OS=macosx
 // REQUIRES: asserts
 

validation-test/Sema/type_checker_perf_failing/rdar30606089.swift.gyb

@@ -0,0 +1,12 @@
+// RUN: not %scale-test --begin 1 --end 3 --step 1 --select incrementScopeCounter %s
+// REQUIRES: OS=macosx
+// REQUIRES: asserts
+
+let derivative = { (t: Double) -> (Double) in
+  return -2.0 / (
+  (1.0 + t)
+%for i in range(1, N):
+  * (1.0 + t)
+%end
+  )
+}