RFR: 8352948: Remove leftover runtime_x86_32.cpp after 32-bit x86 removal

[Stefan Karlsson]

On Wed, 26 Mar 2025 09:31:57 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> As I merged [JDK-8345169](https://bugs.openjdk.org/browse/JDK-8345169), I noticed one more file was left over:
> 
> 
> $ find | grep x86_32
> ./src/hotspot/cpu/x86/runtime_x86_32.cpp
> 
> 
> My bad, this PR removes that leftover.

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24249#pullrequestreview-2716613931