Octane 2 benchmarks

[maximecb]

The Octane 2 benchmarks need to be tested on Higgs. For the benchmarks that do not yet work properly, the cause of the issue needs to be identifier (is it a bug, is Higgs missing a required feature?). In the case of bugs, regression tests should be written and new issues should be filed so that these bugs can be fixed.

I've added the Octane suite to the Higgs repository (under source/benchmarks/octane). I'd be particularly interested in getting the zlib benchmark to work. The benchmark can be run with the following command:

./higgs --e "runZlib()" benchmarks/octane/base.js benchmarks/octane/zlib-data.js benchmarks/octane/zlib.js