Add Java 1.6. and 1.8 java.lang.Math methods into scala.math.package

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scala.math.package is a forwarding operation to java.lang.Math

Update scala.math.package to include methods added after Java 1.5

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Imported From: https://issues.scala-lang.org/browse/SI-9813?orig=1
Reporter: @janekdb
Affected Versions: 2.12.0-M4

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@janekdb said (edited on Jun 12, 2016 4:21:46 PM UTC):
I am interested in picking this up following agreed it should be done.

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Pavel Petlinsky (golem131-at-gmail.com) said:
scala/scala#5271

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@SethTisue said:
scala/scala#5314

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@SethTisue said:
Janek, thanks for your interest and the reviewing help, Pavel, thanks for the PRs — would be very nice to get this into 2.12.0 if we can.

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@janekdb said:
scala/scala#5382

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@lrytz said:
scala/scala#5548 it is!