Add optimization for scalar conversion of `float`/`double` to `ulong`.

[anthonycanino]

AVX512VL adds a number of new scalar conversion for unsigned 32-bit/64-bit integer types to float/double. This issue is meant to address some cases that were not implemented in a previous PR #84384, notably

• double to ulong
• float to ulong

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Issue Details

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AVX512VL adds a number of new scalar conversion for unsigned 32-bit/64-bit integer types to float/double. This PR is meant to address osme cases that were not implemented in a previous PR #84384, notably

double to ulong
float to ulong

Author:	anthonycanino
Assignees:	-
Labels:	area-System.Numerics, untriaged, needs-area-label
Milestone:	-

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

Issue Details

---

AVX512VL adds a number of new scalar conversion for unsigned 32-bit/64-bit integer types to float/double. This issue is meant to address some cases that were not implemented in a previous PR #84384, notably

• double to ulong
• float to ulong

Author:	anthonycanino
Assignees:	-
Labels:	area-CodeGen-coreclr, arch-avx512
Milestone:	9.0.0