Support %_CallFunction in optimized code.

test/mjsunit/regress/regress-apply-to-arguments.js

+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
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+
+// Flags: --allow-natives-syntax
+
+// Test against a context bug (failure to restore to the fixed context
+// register) in the crankshaft-optimized Function.prototype.apply.
+
+function f(x) {
+  var name = 'f';
+  var inner = function () { return name; };
+  return inner;
+}
+
+function g() {
+  // 'name' is intentionally not initialized. GVN would share an early use
+  // of the correct context value, preventing us from observing the bug.
+  var name;
+  var inner = function () { return name; };
+  f.apply(null, arguments);
+  // We should not have f's context in the context register here.
+  name = 'g';
+  return [inner, f()];
+}
+
+for (var i = 0; i < 5; ++i) g(1);
+%OptimizeFunctionOnNextCall(g);
+var arr = g(1);
+assertEquals('g', arr[0]());
+assertEquals('f', arr[1]());