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[WebAssembly] Prototype i64x2.widen_{low,high}_i32x4_{s,u}

Authored by tlively on Oct 30 2020, 3:44 PM.

Description

[WebAssembly] Prototype i64x2.widen_{low,high}_i32x4_{s,u}

As proposed in https://github.com/WebAssembly/simd/pull/290. As usual, these
instructions are available only via builtin functions and intrinsics while they
are in the prototyping stage.

Differential Revision: https://reviews.llvm.org/D90504