Stephen Canon 592d72bba9 Concrete SIMD.init(repeating:) and SIMD.init(lowHalf:highHalf:) optimizations (#81766) ...

WIP to add more overloads to optimize SIMD codegen on concrete types.
Here we do:

- init(repeating:)
- init(lowHalf:highHalf:)

These are always inlined, even in debug, since LLVM knows how to lower
them to one or two instructions on the targets that we care about.

2025-05-27 15:15:13 -04:00

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