RFR: 8335366: Improve String.format performance with fastpath [v7]

[David Schlosnagle]

On Sun, 30 Jun 2024 14:57:26 GMT, David Schlosnagle <duke at openjdk.org> wrote:

>> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   laze init for `decimal fast path locale`
>
> src/java.base/share/classes/java/lang/StringFormat.java line 142:
> 
>> 140:                 str = String.valueOf(arg1);
>> 141:                 coder |= str.coder();
>> 142:                 arg1 = String.valueOf(str);
> 
> nit: `arg1 = String.valueOf(str);` can be avoided by just using `str`:
> 
> Suggestion:
> 
>                 arg1 = str = String.valueOf(arg1);
>                 coder |= str.coder();

alternatively:
Suggestion:

                str = String.valueOf(arg1);
                coder |= str.coder();
                arg1 = str;

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PR Review Comment: https://git.openjdk.org/jdk/pull/19956#discussion_r1660197249