[8u] RFR: 8153641: assert(thread_state == _thread_in_native) failed: Assumed thread_in_native while heap dump

[Andreas Eriksson]

Hi,

Please review this fix for 8153641: assert(thread_state == 
_thread_in_native) failed: Assumed thread_in_native while heap dump

Bug: https://bugs.openjdk.java.net/browse/JDK-8153641
Webrev: http://cr.openjdk.java.net/~aeriksso/8153641/webrev.00/

The crash is because changes I did in JDK-8129419 
<https://bugs.openjdk.java.net/browse/JDK-8129419> do not work with 
solaris logic used for UseVMInterruptibleIO in some cases.
This change reverts the changes I did to the solaris version of 
os::write, and changes heapDumper.cpp to use ::write and ::close 
directly, as it did before.

Thanks,
Andreas
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