Tracy Profiler Integration

[Stefan Koch]

Hello Folks,

I am currently integrating the tracy profiler 
(https://github.com/wolfpld/tracy)
with dmd.

Such that instead of the profiler in druntime, tracy can be used 
for instrumented profiling.


The current progress is here: 
https://github.com/dlang/dmd/compare/master...UplinkCoder:tracy?expand=1
  there are still some teething problems, but I am confident that 
it will be useful soon.

Cheers,

Stefan