[SPARK-1535] ALS: Avoid the garbage-creating ctor of DoubleMatrix#442

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tmyklebu wants to merge 2 commits intoapache:masterfrom

Commits on Apr 18, 2014

Helper function for wrapping Array[Double]'s with DoubleMatrix's.
tmyklebu
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Mention that this is probably fixed as of jblas 1.2.4; repunctuate.
tmyklebu
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