Backport "Scala.js: Emit js.NewArray IR nodes when possible." to 3.3 LTS
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Although there is a *correct* implementation of `sr.Arrays.newArray`, it is not efficient when creating 1-dimensional arrays. The JVM backend special-cases it to emit `newarray` bytecode instructions. We now also special-case it in the JS backend. In the Scala.js IR however, `js.NewArray` only accepts a single dimension. For multiple dimensions, the right thing to do is to emit a direct call to `jlr.Array.newInstance`. [Cherry-picked 2852168]
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Backports scala#22446 to the 3.3.6.
PR submitted by the release tooling.