Integrated: 8334430: Clean up nativeInst_x86.*

[Vladimir Kozlov]

On Tue, 18 Jun 2024 00:59:52 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> Remove code in `nativeInst_x86.*` added by [JDK-8171008](https://bugs.openjdk.org/browse/JDK-8171008) old JAOTC implementation and currently unused after JAOTC code was removed.
> Aarch64 code was already removed by an other cleanup [JDK-8333410](https://bugs.openjdk.org/browse/JDK-8333410).
> 
> I also removed `NativePopReg` class which was added during initial HotSpot development and never used.
> 
> Tested: tier1

This pull request has now been integrated.

Changeset: 6f860f8f
Author:    Vladimir Kozlov <kvn at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/6f860f8f6f69369130ed79e71255005b5beed45a
Stats:     331 lines in 2 files changed: 0 ins; 329 del; 2 mod

8334430: Clean up nativeInst_x86.*

Reviewed-by: jwaters, jiefu

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PR: https://git.openjdk.org/jdk/pull/19758