Integrated: 8330181: Move PcDesc cache from nmethod header

[Vladimir Kozlov]

On Mon, 22 Apr 2024 16:54:40 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> Currently PcDescCache (32 bytes in 64-bit VM: PcDesc* _pc_descs[4]) is allocated in `nmethod` header.
> 
> Moved PcDescContainer (which includes cache) to C heap similar to ExceptionCache to reduce size of `nmethod` header and to remove WXWrite transition when we update the cache in `PcDescCache::add_pc_desc()`.
> 
> Removed `PcDescSearch` class which was leftover from `CompiledMethod` days.
> 
> Tested tier1-4,stress,xcomp and performance.

This pull request has now been integrated.

Changeset: b3bcc494
Author:    Vladimir Kozlov <kvn at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/b3bcc49491b8f8ad337eb4c06201a5468e5c1159
Stats:     120 lines in 4 files changed: 42 ins; 36 del; 42 mod

8330181: Move PcDesc cache from nmethod header

Reviewed-by: dlong, jrose

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PR: https://git.openjdk.org/jdk/pull/18895