RFR: 8357258: x86: Improve receiver type profiling reliability [v8]

[Vladimir Kozlov]

On Thu, 4 Dec 2025 19:14:43 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> 2 slots is the most common case; any benefits from optimizing specifically for it (e.g., unroll the loops)?

Yes, since `row_limit()` is statically know and does not change we can have two versions of code based on its value:
  - `<= 2` slots: fully unrolled (much less instructions)
  - `> 2` slots: current proposed code

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PR Comment: https://git.openjdk.org/jdk/pull/25305#issuecomment-3614447709