shader: classify native half values with shared operand decoding

src/graphics/shader/recompiler/backend/spirv/spirvEmitterInternal.h

@@ -510,6 +510,7 @@ uint32_t EmitClassMaskBitMatch(EmitterState& state, uint32_t mask, uint32_t bit,
                                uint32_t class_match);
 
 uint32_t EmitClassMaskF32(EmitterState& state, uint32_t value, uint32_t mask);
+uint32_t EmitClassMaskF16(EmitterState& state, uint32_t bits, uint32_t mask);
 
 uint32_t EmitMinMaxF32Value(EmitterState& state, uint32_t lhs, uint32_t rhs, bool max_value);