[compiler] [wasm] Introduce Word32/64ReverseBytes as TF Optional Opcode

src/compiler/machine-operator.h

Index: src/compiler/machine-operator.h
diff --git a/src/compiler/machine-operator.h b/src/compiler/machine-operator.h
index 1946ed3385148e22c63b3ed5cca6612f15131239..02977fde716701d7aa2ee6943963f8cab857477e 100644
--- a/src/compiler/machine-operator.h
+++ b/src/compiler/machine-operator.h
@@ -115,13 +115,17 @@ class MachineOperatorBuilder final : public ZoneObject {
     kWord64ReverseBits = 1u << 21,
     kFloat32Neg = 1u << 22,
     kFloat64Neg = 1u << 23,
+    kWord16ReverseBytes = 1u << 24,
+    kWord32ReverseBytes = 1u << 25,
+    kWord64ReverseBytes = 1u << 26,
     kAllOptionalOps =
         kFloat32Max | kFloat32Min | kFloat64Max | kFloat64Min |
         kFloat32RoundDown | kFloat64RoundDown | kFloat32RoundUp |
         kFloat64RoundUp | kFloat32RoundTruncate | kFloat64RoundTruncate |
         kFloat64RoundTiesAway | kFloat32RoundTiesEven | kFloat64RoundTiesEven |
         kWord32Ctz | kWord64Ctz | kWord32Popcnt | kWord64Popcnt |
-        kWord32ReverseBits | kWord64ReverseBits | kFloat32Neg | kFloat64Neg
+        kWord32ReverseBits | kWord64ReverseBits | kFloat32Neg | kFloat64Neg |
+        kWord16ReverseBytes | kWord32ReverseBytes | kWord64ReverseBytes
   };
   typedef base::Flags<Flag, unsigned> Flags;
 
@@ -211,6 +215,9 @@ class MachineOperatorBuilder final : public ZoneObject {
   const Operator* Word64PopcntPlaceholder();
   const OptionalOperator Word32ReverseBits();
   const OptionalOperator Word64ReverseBits();
+  const OptionalOperator Word16ReverseBytes();
+  const OptionalOperator Word32ReverseBytes();
+  const OptionalOperator Word64ReverseBytes();
   bool Word32ShiftIsSafe() const { return flags_ & kWord32ShiftIsSafe; }
 
   const Operator* Word64And();