Add latest WASM proposal support

[tolauwae]

100 files from the official spectests fail due to changes from newly standardized WASM proposals:

• block.wast
• br_if.wast
• br_table.wast
• br.wast
• call_indirect.wast
• call.wast
• conversions.wast
• endianness.wast
• fac.wast
• float_literals.wast
• float_memory.wast
• func_ptrs.wast
• func.wast
• global.wast
• i32.wast
• i64.wast
• if.wast
• int_exprs.wast
• load.wast
• local_get.wast
• local_set.wast
• local_tee.wast
• loop.wast
• memory_init.wast
• memory_fill.wast
• memory_grow.wast
• memory_redundancy.wast
• memory_size.wast
• memory_trap.wast
• nop.wast
• ref_is_null.wast
• ref_null.wast
• return.wast
• select.wast
• simd_address.wast
• simd_bit_shift.wast
• simd_bitwise.wast
• simd_boolean.wast
• simd_conversions.wast
• simd_f32x4_arith.wast
• simd_f32x4.wast
• simd_f32x4_cmp.wast
• simd_f32x4_pmin_pmax.wast
• simd_f32x4_rounding.wast
• simd_f64x2_arith.wast
• simd_f64x2.wast
• simd_f64x2_cmp.wast
• simd_f64x2_pmin_pmax.wast
• simd_f64x2_rounding.wast
• simd_i16x8_arith2.wast
• simd_i16x8_arith.wast
• simd_i16x8_cmp.wast
• simd_i16x8_extadd_pairwise_i8x16.wast
• simd_i16x8_extmul_i8x16.wast
• simd_i16x8_q15mulr_sat_s.wast
• simd_i16x8_sat_arith.wast
• simd_i32x4_arith2.wast
• simd_i32x4_arith.wast
• simd_i32x4_cmp.wast
• simd_i32x4_dot_i16x8.wast
• simd_i32x4_extadd_pairwise_i16x8.wast
• simd_i32x4_extmul_i16x8.wast
• simd_i32x4_trunc_sat_f32x4.wast
• simd_i32x4_trunc_sat_f64x2.wast
• simd_i64x2_arith2.wast
• simd_i64x2_arith.wast
• simd_i64x2_cmp.wast
• simd_i64x2_extmul_i32x4.wast
• simd_i8x16_arith2.wast
• simd_i8x16_arith.wast
• simd_i8x16_cmp.wast
• simd_i8x16_sat_arith.wast
• simd_int_to_int_extend.wast
• simd_lane.wast
• simd_load16_lane.wast
• simd_load32_lane.wast
• simd_load64_lane.wast
• simd_load8_lane.wast
• simd_load.wast
• simd_load_extend.wast
• simd_load_splat.wast
• simd_load_zero.wast
• simd_splat.wast
• simd_store16_lane.wast
• simd_store32_lane.wast
• simd_store64_lane.wast
• simd_store8_lane.wast
• simd_store.wast
• skip-stack-guard-page.wast
• start.wast
• store.wast
• table_fill.wast
• table_get.wast
• table_grow.wast
• table_set.wast
• table_size.wast
• traps.wast
• unreachable.wast
• unreached-valid.wast
• unwind.wast

[tolauwae]

Currently, 23384/25975 (90%) of failing tests are tests for the SIMD proposal.