Add stacked source locators

[bodidebnath]

Type of issue: feature request

Impact: unknown

Development Phase: request

Other information
When looking at generated verilog, we see the leaf level source file such as Mux.scala. We instead need to see a stack trace of sources for this feature to be more helpful.

Please tell us about your environment:
Ubuntu

What is the use case for changing the behavior?
Faster manual debug