[8u60] backport RFR: 8060036 and 8080156

[Andreas Eriksson]

Hi,

I'd like to backport the fix for
8060036 <https://bugs.openjdk.java.net/browse/JDK-8060036>: C2: CmpU 
nodes can end up with wrong type information
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/53707cf9a443

And at the same time the test that was pushed by Tobias with
8080156 <https://bugs.openjdk.java.net/browse/JDK-8080156>: 
Integer.toString(int value) sometimes throws NPE
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/b2e3cbd555fc

The changes applied cleanly from the jdk9 changesets.
A jprt run with the new test passes.

Thanks,
Andreas
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