RFR: 8349814: [leyden] Avoid uncommon traps in preload code

[Vladimir Kozlov]

On Tue, 11 Feb 2025 10:47:37 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Preload code is the C2 code we load very early, before it gets substituted by more advanced C2 code. We are seeing lots of uncommon traps from the preloaded code, though, which invalidates it too early. We can do precompile code without uncommon traps to alleviate this. 
> 
> Additional testing:
>  - [x] Ad-hoc perf tests (see comment below)
>  - [x] Linux x86_64 server fastdebug, `runtime/cds`

src/hotspot/share/compiler/precompiler.cpp line 215:

> 213:       IntxFlagSetting fs2(PerMethodSpecTrapLimit, 0);
> 214: 
> 215:       compile_cached_code(CompLevel_full_optimization, true, CompLevel_full_optimization, CHECK);

Please add ` /*for_preload*/` for second parameter.

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PR Review Comment: https://git.openjdk.org/leyden/pull/38#discussion_r1951177100