Avoid using Function.prototype.call in a number of places in our

src/date.js

Index: src/date.js
diff --git a/src/date.js b/src/date.js
index 9eb607c7e5e160798354f77dc9a02b75098cc4c1..1fb4897921a91fb1d434909136e9d0034f584c29 100644
--- a/src/date.js
+++ b/src/date.js
@@ -605,7 +605,7 @@ function DateToTimeString() {
 
 // ECMA 262 - 15.9.5.5
 function DateToLocaleString() {
-  return DateToString.call(this);
+  return %_CallFunction(this, DateToString);
 }
 
 
@@ -973,7 +973,7 @@ function DateSetYear(year) {
 // do that either.  Instead, we create a new function whose name
 // property will return toGMTString.
 function DateToGMTString() {
-  return DateToUTCString.call(this);
+  return %_CallFunction(this, DateToUTCString);
 }