Revert "PrintAsObjC Test: Don't use blocks in the @cdecl test"

This reverts commit 5e7887d.

Author: hamishknight

test/PrintAsObjC/cdecl-official.swift

@@ -43,6 +43,30 @@ func c_keywordArgNames(auto: Int, union: Int) {}
 func d_returnNever() -> Never { fatalError() }
 // CHECK-LABEL: SWIFT_EXTERN void return_never(void) SWIFT_NOEXCEPT SWIFT_NORETURN;
 
+@cdecl("block_nightmare")
+public func s_block_nightmare(x: @convention(block) (Int) -> Float)
+  -> @convention(block) (CChar) -> Double { return { _ in 0 } }
+// CHECK-LABEL: SWIFT_EXTERN double (^ _Nonnull block_nightmare(SWIFT_NOESCAPE float (^ _Nonnull x)(ptrdiff_t)))(char) SWIFT_NOEXCEPT SWIFT_WARN_UNUSED_RESULT;
+
+@cdecl("block_recurring_nightmare")
+public func t_block_recurring_nightmare(x: @escaping @convention(block) (@convention(block) (Double) -> Int) -> Float)
+  -> @convention(block) (_ asdfasdf: @convention(block) (CUnsignedChar) -> CChar) -> Double {
+  fatalError()
+}
+// CHECK-LABEL: SWIFT_EXTERN double (^ _Nonnull block_recurring_nightmare(float (^ _Nonnull x)(SWIFT_NOESCAPE ptrdiff_t (^ _Nonnull)(double))))(SWIFT_NOESCAPE char (^ _Nonnull)(unsigned char)) SWIFT_NOEXCEPT SWIFT_WARN_UNUSED_RESULT;
+
+@cdecl("function_pointer_nightmare")
+func u_function_pointer_nightmare(x: @convention(c) (Int) -> Float)
+  -> @convention(c) (CChar) -> Double { return { _ in 0 } }
+// CHECK-LABEL: SWIFT_EXTERN double (* _Nonnull function_pointer_nightmare(float (* _Nonnull x)(ptrdiff_t)))(char) SWIFT_NOEXCEPT SWIFT_WARN_UNUSED_RESULT;
+
+@cdecl("function_pointer_recurring_nightmare")
+public func v_function_pointer_recurring_nightmare(x: @escaping @convention(c) (@convention(c) (Double) -> Int) -> Float)
+  -> @convention(c) (@convention(c) (CUnsignedChar) -> CChar) -> Double {
+  fatalError()
+}
+// CHECK-LABEL: SWIFT_EXTERN double (* _Nonnull function_pointer_recurring_nightmare(float (* _Nonnull x)(ptrdiff_t (* _Nonnull)(double))))(char (* _Nonnull)(unsigned char)) SWIFT_NOEXCEPT SWIFT_WARN_UNUSED_RESULT;
+
 // CHECK:      #if defined(__cplusplus)
 // CHECK-NEXT: }
 // CHECK-NEXT: #endif