message: vertexcodec: Undefine SIMD_ macros at the end of the file
  This makes it possible to add SIMD implementation to some other source
  file with a similar #ifdef structure.
  Also rename wasmx_shuffle to wasmx_swizzle since it's a bit more
  correct.
diff: #endif
  #ifdef SIMD_WASM
  -#define wasmx_shuffle_v32x4(v, i, j, k, l) wasm_v8x16_shuffle(v, v, 4 * i, 4 * i + 1, 4 * i + 2, 4 * i + 3, 4 * j, 4 * j + 1, 4 * j + 2, 4 * j + 3, 4 * k, 4 * k + 1, 4 * k + 2, 4 * k + 3, 4 * l, 4 * l + 1, 4 * l + 2, 4 * l + 3)
  -#define wasmx_splat_v32x4(v, i) wasmx_shuffle_v32x4(v, i, i, i, i)
  +#define wasmx_swizzle_v32x4(v, i, j, k, l) wasm_v8x16_shuffle(v, v, 4 * i, 4 * i + 1, 4 * i + 2, 4 * i + 3, 4 * j, 4 * j + 1, 4 * j + 2, 4 * j + 3, 4 * k, 4 * k + 1, 4 * k + 2, 4 * k + 3, 4 * l, 4 * l + 1, 4 * l + 2, 4 * l + 3)
  +#define wasmx_splat_v32x4(v, i) wasmx_swizzle_v32x4(v, i, i, i, i)
  #define wasmx_unpacklo_v8x16(a, b) wasm_v8x16_shuffle(a, b, 0, 16, 1, 17, 2, 18, 3, 19, 4, 20, 5, 21, 6, 22, 7, 23)
  #define wasmx_unpackhi_v8x16(a, b) wasm_v8x16_shuffle(a, b, 8, 24, 9, 25, 10, 26, 11, 27, 12, 28, 13, 29, 14, 30, 15, 31)
  #define wasmx_unpacklo_v16x8(a, b) wasm_v8x16_shuffle(a, b, 0, 1, 16, 17, 2, 3, 18, 19, 4, 5, 20, 21, 6, 7, 22, 23)
  @@ -732,7 +732,7 @@ static v128_t decodeShuffleMask(unsigned char mask0, unsigned char mask1)
  static void wasmMoveMask(v128_t mask, unsigned char& mask0, unsigned char& mask1)
  {
  - v128_t mask_0 = wasmx_shuffle_v32x4(mask, 0, 2, 1, 3);
  + v128_t mask_0 = wasmx_swizzle_v32x4(mask, 0, 2, 1, 3);
  // TODO: when Chrome supports v128.const we can try doing vectorized and?
  uint64_t mask_1a = wasm_i64x2_extract_lane(mask_0, 0) & 0x0804020108040201ull;
  @@ -1221,3 +1221,10 @@ int meshopt_decodeVertexBuffer(void* destination, size_t vertex_count, size_t ve
  return 0;
  }
  +
  +#undef SIMD_NEON
  +#undef SIMD_SSE
  +#undef SIMD_AVX
  +#undef SIMD_WASM
  +#undef SIMD_FALLBACK
  +#undef SIMD_TARGET
  