i64x2.abs instruction

Author: Maratyszcza

proposals/simd/BinarySIMD.md

@@ -179,6 +179,7 @@ For example, `ImmLaneIdx16` is a byte with values in the range 0-15 (inclusive).
 | `i32x4.max_s`                   |    `0xb8`| -                        |
 | `i32x4.max_u`                   |    `0xb9`| -                        |
 | `i32x4.dot_i16x8_s`             |    `0xba`| -                        |
+| `i64x2.abs`                     |    `0xc0`| -                        |
 | `i64x2.neg`                     |    `0xc1`| -                        |
 | `i64x2.bitmask`                 |    `0xc4`| -                        |
 | `i64x2.widen_low_i32x4_s`       |    `0xc7`| -                        |
@@ -262,4 +263,4 @@ For example, `ImmLaneIdx16` is a byte with values in the range 0-15 (inclusive).
 | `i16x8.extadd_pairwise_i8x16_s` |     `TBD`| -                        |
 | `i16x8.extadd_pairwise_i8x16_u` |     `TBD`| -                        |
 | `i32x4.extadd_pairwise_i16x8_s` |     `TBD`| -                        |
-| `i32x4.extadd_pairwise_i16x8_u` |     `TBD`| -                        |
+| `i32x4.extadd_pairwise_i16x8_u` |     `TBD`| -                        |