Implement ES6 completion semantics (--harmony-completion).

test/mjsunit/harmony/block-for-sloppy.js

Index: test/mjsunit/harmony/block-for-sloppy.js
diff --git a/test/mjsunit/harmony/block-for-sloppy.js b/test/mjsunit/harmony/block-for-sloppy.js
index eee8e0b5cdc73198914debb77e9ab2b395b8c58f..e9e960504bfeb43341df00b4aa9a881283dd2ea3 100644
--- a/test/mjsunit/harmony/block-for-sloppy.js
+++ b/test/mjsunit/harmony/block-for-sloppy.js
@@ -26,6 +26,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --no-legacy-const --harmony-sloppy --harmony-sloppy-let
+// Flags: --harmony-completion
 
 function props(x) {
   var array = [];
@@ -190,10 +191,12 @@ assertEquals(undefined, eval("for (let i = 0; i < 10; i++) { continue; i; }"));
 assertEquals(0, eval("for (let i = 0; true;) { i; break; }"));
 assertEquals(0, eval("for (const i = 0; true;) { i; break; }"));
 assertEquals(9, eval("for (let i = 0; i < 10; i++) { i; continue; }"));
-assertEquals(3, eval("for (let i = 0; true; i++) { i; if (i >= 3) break; }"));
-assertEquals(2, eval("for (let i = 0; true; i++) { if (i >= 3) break; i; }"));
 assertEquals(
-  2, eval("for (let i = 0; i < 10; i++) { if (i >= 3) continue; i; }"));
+  undefined, eval("for (let i = 0; true; i++) { i; if (i >= 3) break; }"));
+assertEquals(
+  undefined, eval("for (let i = 0; true; i++) { if (i >= 3) break; i; }"));
+assertEquals(
+  undefined, eval("for (let i = 0; i < 10; i++) { if (i >= 3) continue; i; }"));
 assertEquals(undefined, eval("foo: for (let i = 0; true;) { break foo; }"));
 assertEquals(undefined, eval("foo: for (const i = 0; true;) { break foo; }"));
 assertEquals(3, eval("foo: for (let i = 3; true;) { i; break foo; }"));