RFR: 8257631: C2: Assertion failure in ArrayCopyNode::get_count() during late inlining

[Nils Eliasson]

On Wed, 2 Dec 2020 21:45:57 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> The problematic assert in ArrayCopyNode::get_count() is specifically targeted at parsing phase, but it doesn't filter out late inlining which exposes the problematic IR shape the assert guards against.
> 
> Testing:
> - [x] hs-tier1-6 w/ -XX:+AlwaysIncrementalInline

Looks good.

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Marked as reviewed by neliasso (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1581