RFR: 8348180: Remove mention of include of precompiled.hpp from the HotSpot Style Guide

[Aleksey Shipilev]

On Tue, 21 Jan 2025 12:29:33 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> [JDK-8347909](https://bugs.openjdk.org/browse/JDK-8347909) removed the need for HotSpot devs to include the precompiled.hpp. This is the PR to reflect that.
> 
> I know that there is some process around updating the style guide, but I can't find it, so I'm starting with a plain PR.

This part looks dangling now:


 * precompiled.hpp is just a build time optimization, so don't rely on
it to resolve include problems.


Maybe move the line at the end of the list and phrase it as:

"* Consider adding the frequently used header includes to precompiled.hpp. This can improve build times, but the improvement needs to be validated. precompiled.hpp is just a build time optimization, so don't rely on it to resolve include problems."

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PR Review: https://git.openjdk.org/jdk/pull/23210#pullrequestreview-2564920258