RFR: 8318457: Use prefix-less prepend methods directly to reduce branches in String concat expressions

[Jim Laskey]

On Wed, 18 Oct 2023 11:56:14 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> In #16006 using `StringConcatFactory` seem to induce a run-to-run variance. One idea to reduce this is to generate expression trees with fewer branches by looking up and using the prefix-less `prepend` methods directly for cases where constant is null/empty so that the prefixed prepender will always deal with a non-null prefix constant.

Marked as reviewed by jlaskey (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16244#pullrequestreview-1685497018