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JIT: Always create FIELD_LIST for struct args in physical promotion #118778

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Today physical promotion will create FIELD_LIST for returned struct values. However, arguments did not get the same treatment and had constraints motivated by old limitations of the backend. Since those limitations are gone now we can just indiscriminately produce FIELD_LIST in physical promotion.

@jakobbotsch jakobbotsch added this to the 11.0.0 milestone Aug 15, 2025
@github-actions github-actions bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Aug 15, 2025
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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