RFR: 8315580: Remove unused java_lang_String::set_value_raw()

[Aleksey Shipilev]

On Sun, 3 Sep 2023 18:55:45 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this trivial change to remove the unused function java_lang_String::set_value_raw.
> 
> Testing:
> mach5 tier1

Looks fine.

AFAICS, the last use was removed here: https://github.com/openjdk/jdk/commit/1ff4646ed5f64a786a2f2688529e13d6d9f47fa3#diff-1f28d52b3481c769173392d3f4183e45408edd3e9f8f645cfee424e6f720dd15L774

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15552#pullrequestreview-1609206626