Generate assembly listing on compile

I noted that Wayne Holder's ATTiny10IDE generates an assembly listing on build which helps identify any latency such as from a timer interrupt until the first actual line of code is executed such as in Paul Stoffregen's FreqCount library - including such a feature would be helpful for myself and other programmers.

Start by tracing the Arduino IDE 1.x build flow and how compiler output is handled during a build. Determine where an assembly listing could be generated and exposed, then verify that a completed build makes the listing available for inspecting interrupt-to-code latency.

Written by the indexing model from the issue text.