RFR: 8333893: Optimization for StringBuilder append boolean & null

[Chen Liang]

On Mon, 10 Jun 2024 12:12:58 GMT, Shaojin Wen <duke at openjdk.org> wrote:

> After PR https://github.com/openjdk/jdk/pull/16245, C2 optimizes stores into primitive arrays by combining values ​​into larger stores.
> 
> This PR rewrites the code of appendNull and append(boolean) methods so that these two methods can be optimized by C2.

I think for that C2 JIT to work, we need to merge the `'t' 'r' 'u' 'e'` ascii bytes into an int constant. Same for `false`.

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PR Comment: https://git.openjdk.org/jdk/pull/19626#issuecomment-2158504397