[8u] request for approval: 8174164 & 8175097: SafePointNode::_replaced_nodes breaks with irreducible loops

[Roland Westrelin]

Hi,

I'd like to backport 8174164 (and its test case 8175097) to 8u as it's
an issue reported by one of our (Red Hat) customers. The patch doesn't
apply cleanly: the part of library_call.cpp fails to apply but given
library_call.cpp in 8u doesn't need to be changed for that fix, that
part of the patch can simply be removed. So I assume no re-review is
necessary. It was pushed to jdk9 1 week ago and hasn't caused any follow
up bugs that I know of.

https://bugs.openjdk.java.net/browse/JDK-8174164
http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/35db0413819a
https://bugs.openjdk.java.net/browse/JDK-8175097
http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/8241f87c4712

8u webrev:

http://cr.openjdk.java.net/~roland/8174164.8u/webrev.00/

Roland.