RFR: 8324765: C2 SuperWord: remove dead code: SuperWord::insert_extracts

[Vladimir Kozlov]

On Fri, 26 Jan 2024 15:14:13 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> Subtask of https://github.com/openjdk/jdk/pull/16620
> 
> As far as all tests and code study have showed me, SuperWord::insert_extracts is dead.
> 
> I am replacing it with verification code, that checks that no ExtractNode is required.
> 
> **Details**
> 
> All the relevant cases are marked as "unprofitable" in `SuperWord::profitable`, see:
> https://github.com/openjdk/jdk/blob/dfdd2174d7af5e3e995147484db17b45b006f6d0/src/hotspot/share/opto/superword.cpp#L1912-L1915

Good.

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Marked as reviewed by kvn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17589#pullrequestreview-1846419744