Tweak the TurboFan pipeline for stub compilation.

src/runtime.js

Index: src/runtime.js
diff --git a/src/runtime.js b/src/runtime.js
index 7d82dfa8463fac3305ca98f42dd9a5545444a40c..21c96efc208b3942aeb6e6cf990ca4ae0c3d7193 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -694,3 +694,9 @@ function ToPositiveInteger(x, rangeErrorName) {
 // that is cloned when running the code.  It is essential that the
 // boilerplate gets the right prototype.
 %FunctionSetPrototype($Array, new $Array(0));
+
+

[Michael Starzinger, 2015/03/17 17:28:55]

nit: Can we put in a separator comment here like the following? This would make
it clear what these functions are intended for.

/* -----------------------------------------------
   - - -   J a v a S c r i p t   S t u b s   - - -
   -----------------------------------------------
*/

[Sven Panne, 2015/03/18 08:45:55]

Done.

+function StringLengthStub(name) {

[Michael Starzinger, 2015/03/17 17:28:55]

nit: Also maybe make this one function all-uppercase, so that the comment in
lines 7 to 9 applies.

[Sven Panne, 2015/03/18 08:45:55]

Done.

+  var receiver = this;  // implicit first parameter
+  return %_StringLength(%_JSValueValue(receiver));
+}