Extending instrumentation to more accurately track tags (work in progress).
Small fixes.
More fixes and updates.
Runtime support for new tagging infrastructure.
Fixed some silly instrumentation bugs.
Now can run very simple jQuery client under instrumentation.
Various fixes.
Removed debugger statement.
Need to unwrap function result when passing it back to native code.
Give observer information about whether a call is a function or a method call; removed (most) uses of __tag (this should be up to the observer).
Now flattening reflective calls inside the runtime (as opposed to the observer); also changed treatment of untagged heap properties: we now call back into the observer to ask it to provide a tag.
Fixed code for wrapping optional arguments (V8 doesn't implement write back semantics of 'arguments' array).
Don't wrap optional arguments in callWrapped either.
Pass source position as argument to tagLiteral.