[WIP] Add nofib testing

[gkaracha]

Closes #639.

Set up the nofib directory:

• Gather nofib main programs and their arguments from the upstream nofib repo.
• Flatten the structure (only two levels) and fix/remove symlinks.
• Remove tests that don't apply to asterius yet and other redundant files.
• Replace local Makefiles with explicit FAST_OPTS, NORM_OPTS and SLOW_OPTS input files.

After that move on to CI-related tasks:

• Set up the native/asterius comparison and set it up as a standalone CI job.
• Generate V8 CPU/heap profiler report and serve them as CI artifacts, so we can examine the bottlenecks visually.

[TerrorJack]

Additional notes:

• We'll likely need to evaluate the influence of different link-time options (e.g. enabling tail calls, yolo mode, different gc thresholds), since they can have a significant impact on the overall clock time. Also, certain node V8 command-line options (use node --v8-options to get a complete list; will discuss which options to test later)
• For getting a flame graph from V8 profiling reports, I tried a few tools and 0x seems to be pleasant to use. Use the --verbose-err link-time option to ensure wasm function names are visible in the output flame graph.