RFR: 8263577: C2: reachable nodes shouldn't have dead uses at the end of optimizations [v2]

Mon Mar 15 14:16:09 UTC 2021

On Mon, 15 Mar 2021 13:56:10 GMT, Roland Westrelin <roland at openjdk.org> wrote:

> In the case of subtypenode.cpp, some nodes were created and never attached to any use.

Ok, makes sense. 

So, you move the code out of `if (super_t->singleton() && ...) {` to avoid putting `subklass` on the worklist?

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PR: https://git.openjdk.java.net/jdk/pull/3012