Scala.js: Fix 3 codegen bugs to enable RegressionTest.scala.
#9630
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The codegen chooses `jstpe.NoType` (`void`) over the declared type of a `Match` node. That is normally fine, except if the declared type was `Nothing`, in which case we must retain it, because the enclosing statement might be demanding an expression of type `Nothing`.
This is a port of scala-js/scala-js@b7f3e23 in Scala.js upstream, which was itself a port to the JS back-end of scala/scala@6abb6ba in the Scala 2 JVM back-end. Together with the two parent commits, this fixes the `RegressionTest.scala` test suite, which we now enable.
dottybot
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Aug 24, 2020
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nicolasstucki
approved these changes
Aug 25, 2020
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