Update source-map and skip validation #1620
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Use new flag on `SourceMapGenerator` to skip assertions against mappings, as Traceur is known to produce valid calls. Optimally this would be an option to Traceur, and validation would be enabled in tests, but hard-coding for now.
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| LGTM |
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Leverage the new
skipValidationflag insource-mapto disable unneeded safety checks during source map generation.Yields large performance boosts, both passively from using the latest version and additionally from using the flag (see mozilla/source-map#150)