MIPS[64]: Implement Word[32|64]ReverseByte instruction selector unit tests

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index 49ff64535542b9690512422c34efe231c5cd03ac..af36b8c08ac8b4a8758118597b672d6a3bec8b5f 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -653,6 +653,12 @@ class V8_EXPORT_PRIVATE RawMachineAssembler {
   Node* Float64RoundTiesEven(Node* a) {
     return AddNode(machine()->Float64RoundTiesEven().op(), a);
   }
+  Node* Word32ReverseBytes(Node* a) {
+    return AddNode(machine()->Word32ReverseBytes().op(), a);
+  }
+  Node* Word64ReverseBytes(Node* a) {
+    return AddNode(machine()->Word64ReverseBytes().op(), a);
+  }
 
   // Float64 bit operations.
   Node* Float64ExtractLowWord32(Node* a) {