[Test] Add tests for lazy immediate mode

Author: Zak Kent

test/Interpreter/lazy/deferred_syntax_errors.swift

@@ -0,0 +1,41 @@
+// RUN: %target-jit-run %s -enable-experimental-feature LazyImmediate | %FileCheck %s
+
+// Tests that parsing of function bodies is deferred
+// to runtime when the interpreter is invoked using
+// experimental lazy compilation. Syntax errors in
+// functions not executed at runtime should be ignored.
+
+public func foo() {
+  3 +
+}
+
+// Syntax error in `foo` should be ignored
+
+// CHECK: hello
+print("hello")
+
+public func bar(_ b: Bool) {
+  if b {
+    print("bar")
+  } else {
+    foo()
+  }
+}
+
+// Function `foo` with syntax error is not executed
+// by bar, so the type error should again be ignored
+
+// CHECK: bar
+bar(true)
+
+public func add(_ x: Int, _ y: Int, _ z: Int) -> Int {
+  return x + y + z
+}
+
+public func sub(_ x: Int, _ y: Int) -> Int {
+  return add(x,
+}
+
+// CHECK: 6
+print(add(1, 2, 3))
+

test/Interpreter/lazy/deferred_type_errors.swift

@@ -0,0 +1,40 @@
+// RUN: %target-jit-run %s -enable-experimental-feature LazyImmediate | %FileCheck %s
+
+// Tests that type checking of function bodies is
+// deferred to runtime when the interpreter is invoked
+// using experimental lazy compilation. Type errors in
+// functions not executed at runtime should be ignored.
+
+public func foo() {
+  3 + true
+}
+
+// Type error in `foo` should be ignored
+
+// CHECK: hello
+print("hello")
+
+public func bar(_ b: Bool) {
+  if b {
+    print("bar")
+  } else {
+    foo()
+  }
+}
+
+// Function `foo` with type error is not executed
+// by bar, so the type error should again be ignored
+
+// CHECK: bar
+bar(true)
+
+public func add(_ x: Int, _ y: Int, _ z: Int) -> Int {
+  return x + y + z
+}
+
+public func sub(_ x: Int, _ y: Int) -> Int {
+  return add(x, -y)
+}
+
+// CHECK: 6
+print(add(1, 2, 3))