standardizing Error.stack or equivalent

[Jason Orendorff]

On Thu, Mar 27, 2014 at 12:31 PM, Mark Miller <erights at gmail.com> wrote:
> Mozillians, why did you add this extra information?

Well... if the point of Error.stack is to provide diagnostic
information for exceptions, for the purpose of debugging, this
information is critical.

Without this, eval() or Function() often won't appear on the stack
anywhere. What we were doing before didn't reveal that eval or
Function was involved at all. It was misleading and unhelpful.

-j