RFR: Drop x86_32 code from x86_64-specific files

[Ron Pressler]

On Thu, 14 Oct 2021 14:29:00 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> There are instances of x86_32 code in x86_64-specific files. That code would not be ever used and thus would bit rot, as it would never be compiled on x86_32. The porting to x86_32 would make the x86_32-specific versions of the StubGenerator. This simplifies x86_64 StubGenerator a bit.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `jdk_loom hotspot_loom`

Nice!

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Marked as reviewed by rpressler (Lead).

PR: https://git.openjdk.java.net/loom/pull/77