Hide Portals When they aren't wrapped in a host component when Parent Suspends

[lunaruan]

Currently, when a node suspends, if its subtree contains a portal, the portal is not hidden. This hides portals in the subtree when it's not wrapped in a host component .

[sizebot]

Details of bundled changes.

Comparing: 10277cc...e31a360

react-art

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-art.development.js	0.0%	0.0%	669.15 KB	669.39 KB	145.49 KB	145.51 KB	UMD_DEV
react-art.production.min.js	🔺+0.1%	🔺+0.1%	103.87 KB	104 KB	31.61 KB	31.63 KB	UMD_PROD
react-art.development.js	0.0%	0.0%	599.78 KB	600.02 KB	128.08 KB	128.1 KB	NODE_DEV
react-art.production.min.js	🔺+0.2%	🔺+0.2%	68.89 KB	69.01 KB	20.89 KB	20.92 KB	NODE_PROD
ReactART-dev.js	0.0%	0.0%	614.49 KB	614.73 KB	127.91 KB	127.93 KB	FB_WWW_DEV
ReactART-prod.js	🔺+0.2%	🔺+0.2%	231.33 KB	231.72 KB	39.07 KB	39.13 KB	FB_WWW_PROD

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