RFR: 8348687: [BACKOUT] C2: Non-fluid StringBuilder pattern bails out in OptoStringConcat

[Aleksey Shipilev]

On Wed, 29 Jan 2025 14:36:08 GMT, Theo Weidmann <tweidmann at openjdk.org> wrote:

> Backs out the changes introduced in [JDK-8341696](https://bugs.openjdk.org/browse/JDK-8341696) as they cause a bug in a benchmark.

Looks like a proper and trivial backout, thanks.

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23348#pullrequestreview-2581581301