[WebAssembly] Regen ctselect tests, drop SIMD <8xi16>/<16xi8> cases The core PR's new CT_SELECT expansion normalizes scalar mask to the vector element type. On WebAssembly that fails for i16/i8 element vectors because those aren't legal scalar register types, triggering "Unexpected illegal type!" in LegalizeOp. Drop <8 x i16> and <16 x i8> cases from the SIMD vector test pending a fix in lib/CodeGen/SelectionDAG/LegalizeDAG.cpp (see TODO at top). Regen CHECK lines for everything else.
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