Original implementation was passing the wrong argument.

Breakpoints, tracepoints, etc.. take a location spec as input. This
patch improves the expressiveness of that API. It allows:

* Breakpoint at line
* Breakpoint at function (handling package / receiver smoothing)
* Breakpoint at address
* Breakpoint at file:line
* Setting breakpoint based off regexp

When running `dlv help trace` the help output would display:

dlv trace [regexp] [flags] [flags]

This patch removes the [flags] duplication.

Fixes #188

Passing the '-s' flag to the linker in < Go 1.5 emits an error and
produces a binary that, once codesigned (I believe) will cause an
immediate bus error and terminate.

Fixes #192

Fixes #182

fixes issue #179

For more information see: https://github.com/golang/go/issues/11887

the entry point of a function is the beginning of the prologue, which can be run multiple times for each invocation of a function if the stack needs to be expanded or the scheduler needs to be run.

The process will already be killed via withTestProcess