[WebAssembly] Custom combines for f32x4.demote_zero_f64x2
Replace the clang builtin function and LLVM intrinsic for f32x4.demote_zero_f64x2 with combines from normal SDNodes. Also add missing combines for i32x4.trunc_sat_zero_f64x2_{s,u}, which share the same pattern. Differential Revision: https://reviews.llvm.org/D105755
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