Throw on unhandled SSR suspending

[gaearon]

This adds a throw for suspending outside of Suspense, equivalent to what we do on the client side.

[sebmarkbage]

Shouldn't we also throw a nicer error than the Promise if we don't have enableSuspenseServerRenderer on?

[sizebot]

ReactDOM: size: 🔺+0.3%, gzip: 🔺+0.3%

Details of bundled changes.

Comparing: e89c19d...13395e6

react-dom

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-dom.profiling.min.js	0.0%	0.0%	115.03 KB	115.03 KB	36.28 KB	36.29 KB	NODE_PROFILING
react-dom-server.browser.development.js	+0.5%	+0.4%	140.04 KB	140.8 KB	36.79 KB	36.92 KB	UMD_DEV
react-dom-server.browser.production.min.js	🔺+0.3%	🔺+0.3%	19.68 KB	19.74 KB	7.32 KB	7.34 KB	UMD_PROD
react-dom-unstable-fizz.browser.development.js	0.0%	+0.1%	3.78 KB	3.78 KB	1.53 KB	1.53 KB	UMD_DEV
react-dom-test-utils.production.min.js	0.0%	🔺+0.1%	11.2 KB	11.2 KB	4.15 KB	4.15 KB	UMD_PROD
react-dom-unstable-fizz.browser.production.min.js	0.0%	🔺+0.1%	1.2 KB	1.2 KB	701 B	702 B	UMD_PROD
react-dom-unstable-fizz.browser.development.js	0.0%	+0.1%	3.61 KB	3.61 KB	1.48 KB	1.48 KB	NODE_DEV
react-dom-test-utils.production.min.js	0.0%	0.0%	10.98 KB	10.98 KB	4.08 KB	4.08 KB	NODE_PROD
react-dom-unstable-fizz.browser.production.min.js	0.0%	🔺+0.2%	1.04 KB	1.04 KB	632 B	633 B	NODE_PROD
react-dom.production.min.js	0.0%	0.0%	111.43 KB	111.43 KB	35.91 KB	35.91 KB	UMD_PROD
react-dom-server.node.development.js	+0.6%	+0.4%	137.19 KB	137.95 KB	36.07 KB	36.2 KB	NODE_DEV
react-dom.production.min.js	0.0%	0.0%	111.4 KB	111.4 KB	35.34 KB	35.34 KB	NODE_PROD
react-dom-server.node.production.min.js	🔺+0.3%	🔺+0.1%	20.01 KB	20.07 KB	7.48 KB	7.49 KB	NODE_PROD
react-dom-server.browser.development.js	+0.6%	+0.4%	136.17 KB	136.93 KB	35.85 KB	35.98 KB	NODE_DEV
react-dom-server.browser.production.min.js	🔺+0.3%	🔺+0.1%	19.6 KB	19.66 KB	7.32 KB	7.33 KB	NODE_PROD
react-dom-unstable-native-dependencies.development.js	0.0%	0.0%	60.71 KB	60.71 KB	15.85 KB	15.85 KB	UMD_DEV
react-dom-unstable-native-dependencies.production.min.js	0.0%	0.0%	10.75 KB	10.75 KB	3.68 KB	3.68 KB	UMD_PROD
ReactDOMServer-dev.js	+0.6%	+0.4%	140.44 KB	141.34 KB	35.45 KB	35.6 KB	FB_WWW_DEV
ReactDOMServer-prod.js	🔺+0.2%	🔺+0.2%	48.02 KB	48.13 KB	11.02 KB	11.05 KB	FB_WWW_PROD
react-dom-unstable-fizz.node.development.js	0.0%	+0.1%	3.87 KB	3.87 KB	1.51 KB	1.51 KB	NODE_DEV
react-dom-unstable-native-dependencies.production.min.js	0.0%	0.0%	10.49 KB	10.49 KB	3.58 KB	3.58 KB	NODE_PROD
react-dom-unstable-fizz.node.production.min.js	0.0%	🔺+0.3%	1.1 KB	1.1 KB	666 B	668 B	NODE_PROD

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