RFR: 8336856: Optimize String Concat

[Shaojin Wen]

On Mon, 22 Jul 2024 14:27:39 GMT, Chen Liang <liach at openjdk.org> wrote:

> For the question [here](https://github.com/openjdk/jdk/pull/20253#issuecomment-2242267516):
> 
> 1. A sample of loading an otherwise inaccessible method handle from class data: https://github.com/openjdk/jdk/blob/c3226aaeb810521257e961be5763552c86ee5651/src/java.base/share/classes/java/lang/invoke/InnerClassLambdaMetafactory.java#L517-L518
> 2. In offline discussion with Claes, we are thinking of generating direct bytecode to avoid the overhead of creating a lot of intermediate method handles.

The ClassData of LambdaMetafactory has only one MethodHandle, but multiple MethodHandles are needed here.

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PR Comment: https://git.openjdk.org/jdk/pull/20273#issuecomment-2244656110