RFR (S) 8073550 : java* tools: replace obj.getClass hacks with Assert.checkNonNull or Objects.requireNonNull

[Aleksey Shipilev]

Hi,

Please review and sponsor the cleanup in langtools code:
  https://bugs.openjdk.java.net/browse/JDK-8073550
  http://cr.openjdk.java.net/~shade/8073550/webrev.01/

It replaces the getClass "hacks" with either proper Asserts, or
Objects.requireNonNull if Asserts are not available over the module
boundaries.

Thanks,
-Aleksey.

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