fixes for angular hello: String + and disable broken arg parsing

lib/runtime/dart/_interceptors.js

Index: lib/runtime/dart/_interceptors.js
diff --git a/lib/runtime/dart/_interceptors.js b/lib/runtime/dart/_interceptors.js
index 3884e240785c970675cfd40d7e4996cce89098b1..413850622076158bcb4d84723732716a55d01cf4 100644
--- a/lib/runtime/dart/_interceptors.js
+++ b/lib/runtime/dart/_interceptors.js
@@ -78,7 +78,7 @@ var _interceptors;
       }
     }
     get isNegative() {
-      return dart.equals(this, 0) ? 1['/'](this) < 0 : this['<'](0);
+      return dart.equals(this, 0) ? core.int['/'](1, this) < 0 : this['<'](0);
     }
     get isNaN() {
       return isNaN(this);
@@ -214,7 +214,7 @@ var _interceptors;
         result = result + dart.dindex(match, 2);
         exponent = dart.notNull(exponent) - dart.dindex(match, 2).length;
       }
-      return core.String['+'](result, core.String['*']("0", exponent));
+      return dart.notNull(result) + core.String['*']("0", exponent);
     }
     toString() {
       if (dart.notNull(dart.equals(this, 0)) && 1 / this < 0) {
@@ -387,8 +387,8 @@ var _interceptors;
     }
     static [_bitCount](i) {
       i = dart.as(dart.dsend(JSInt[_shru](i, 0), '-', dart.dsend(JSInt[_shru](i, 1), '&', 1431655765)), core.int);
-      i = (dart.notNull(i) & 858993459)['+'](dart.dsend(JSInt[_shru](i, 2), '&', 858993459));
-      i = 252645135 & i['+'](JSInt[_shru](i, 4));
+      i = core.int['+'](dart.notNull(i) & 858993459, dart.dsend(JSInt[_shru](i, 2), '&', 858993459));
+      i = 252645135 & core.int['+'](i, JSInt[_shru](i, 4));
       i = dart.notNull(i) + dart.notNull(dart.as(JSInt[_shru](i, 8), core.int));
       i = dart.notNull(i) + dart.notNull(dart.as(JSInt[_shru](i, 16), core.int));
       return dart.notNull(i) & 63;
@@ -740,7 +740,7 @@ var _interceptors;
       let delta = dart.notNull(width) - dart.notNull(this.length);
       if (dart.notNull(delta) <= 0)
         return this;
-      return core.String['+'](core.String['*'](padding, delta), this);
+      return core.String['*'](padding, delta) + dart.notNull(this);
     }
     padRight(width, padding) {
       if (padding === void 0)