Thomas Lively 1992e30c2d [WebAssembly] Prototype i8x16.popcnt ...

As proposed at https://github.com/WebAssembly/simd/pull/379. Use a target
builtin and intrinsic rather than normal codegen patterns to make the
instruction opt-in until it is merged to the proposal and stabilized in engines.

Differential Revision: https://reviews.llvm.org/D89446

2020-10-15 21:18:22 +00:00

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