Performance regression for tables that use shadow dom emulation

Large tables with e.g. 200 rows and 20 columns are really slow due to calling LightDom._collectAllContentTags (see https://github.com/angular/angular/blob/master/modules/angular2/src/render/dom/shadow_dom/light_dom.ts#L54) for every view that is added to a ViewContainer, resulting into a O^2 runtime.

fix(render): only look for content tags in views that might have them.

This will be solved by #2529

As #2529 landed in master, content projection is done during compilation, i.e. there is no performance penalty of using in during runtime.

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