v86/docs/profiling.md

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v86 has a built-in profiler, which instruments generated code to count certain
events and types of instructions. It can be used by building with `make
debug-with-profiler` and opening debug.html.
For debugging networking, packet logging is available in the UI in both debug
and release builds. The resulting `traffic.hex` file can be loaded in Wireshark
using file -> import from hex -> tick direction indication, timestamp %s.%f.