[llvm][SPIRV] Expose fast `popcnt` support for SPIR-V targets (#109845) This adds the TTI predicate for conveying the availability of fast `popcnt`, which subsequently allows passes like `LoopIdiomRecognize` to collapse known popcount patterns. Since SPIR-V natively exposes `OpBitcount`, it seems preferable to compress the resulting code, and retain the information, even if a concrete target might have to expand back into a loop structure.
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