Follow up submodule updates #121 about escargot

[yichoi]

@pmarkee

[pmarkee]

Update: #141 has landed, so we now have the class keyword. The tests for #121 are still failing because they also require inheritance, which is not implemented yet, but will be in progress soon AFAIK.

[pmarkee]

@yichoi it seems that vendortests for other patches (for example #157 #161 #180 ) also depend on some es6 features that are not yet implemented (let, const, extends). I think we could collect all related cases under this issue and do the necessary submodule update later.
Also, should I revert Samsung/js_vendor_tc#3 ? It is going to keep failing until necessary es6 features are implemented and it could be a blocker for other submodule updates.

[clover2123]

I think some necessary features like let, const are not easy to implement quickly, so it seems better to revert Samsung/js_vendor_tc#3 to update and use the recent verdortests.

[yichoi]

I see, I will remove Samsung/js_vendor_tc#3 commit from the js_vendor_tc repo then update this submodule of escargot repo too.

[yichoi]

removed by #193