WSL needs float and double support

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Migrated from https://bugs.webkit.org/show_bug.cgi?id=177058:

At 2017-09-17T21:20:40Z, mmaxfield@apple.com wrote:
WSL needs float and double support

[litherum]

At 2017-09-17T21:28:36Z, mmaxfield@apple.com wrote:
Created attachment 321055
Patch

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At 2017-09-17T23:38:32Z, mmaxfield@apple.com wrote:
I probably should add native operator float(double) and native operator double(float).

[litherum]

At 2017-09-18T00:32:03Z, mmaxfield@apple.com wrote:
Committed r222138: http://trac.webkit.org/changeset/222138

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At 2017-09-27T19:27:32Z, webkit-bug-importer@group.apple.com wrote:
rdar://problem/34693315