Improve type resolution of class constants. #5591
Merged
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Handle array plus operator (fixes #5588).
Handle array spread operator.
Improve string concatenation to resolve to literal instead of unknown string.
I feel like it should be possible to let ConstantTypeResolver take advantage of the better type analysis in ArrayAnalyzer, ConcatAnalyzer, etc, but it would require a restructuring that's beyond me for the time being.