RFR (S) 8150514: C1 crashes in Canonicalizer::do_ArrayLength() after fix for JDK-8150102

[Aleksey Shipilev]

Hi,

The C1 Canonicalizer fix for arraylength folding (JDK-8150102) crashes
the VM when array constant is "null", and ArrayConstant is not
available. This happens every so often in nightly testing.

Here is a quick fix for that:
  http://cr.openjdk.java.net/~shade/8150514/webrev.01/

Testing: regression test in Linux x86_64/fastdebug

Thanks,
-Aleksey

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