RFR: 8274879: Replace uses of StringBuffer with StringBuilder within java.base classes [v2]

[Naoto Sato]

On Tue, 12 Oct 2021 20:39:13 GMT, Andrey Turbanov <duke at openjdk.java.net> wrote:

>> StringBuffer is a legacy synchronized class. There are more modern alternatives which perform better:
>> 1. Plain String concatenation should be preferred
>> 2. StringBuilder is a direct replacement to StringBuffer which generally have better performance
>> 
>> In [JDK-8264029](https://bugs.openjdk.java.net/browse/JDK-8264029)  I migrated only usages which were automatically detected by IDEA. It turns out there are more usages which can be migrated.
>
> Andrey Turbanov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8274879: Replace uses of StringBuffer with StringBuilder within java.base classes
>   revert changes in spec to avoid CSR

Marked as reviewed by naoto (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5432