RFR: 8365053: Refresh hotspot precompiled.hpp with headers based on current frequency [v14]

[Erik Joelsson]

On Mon, 25 Aug 2025 16:39:01 GMT, Francesco Andreuzzi <duke at openjdk.org> wrote:

> Apart from that, I still share Kim's worry that the platform with the most potential impact is Windows, and we have no numbers at all there.

I did run a quick comparison on Windows with an early version of this patch and it was basically a wash compared to before (slightly slower but could just be variance). I just reran with the latest patch and saw a slight improvement. Could still just be variance, but here are the numbers for running `make hotspot` immediately after `make clean-hotspot` to really isolate just the hotspot build. I warmed up caches by first building hotspot from scratch before cleaning.

Baseline (@57434c73eac9bd6557b09d4a057e3a2a18f382b4): 4m38
This branch (@2f97d57b55fc838b30cf0d730c6119bf97749c6b): 4m30, 4m33

I only did one baseline run and then 2 on the branch. It's enough to show no regression.

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PR Comment: https://git.openjdk.org/jdk/pull/26681#issuecomment-3221205865