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

src/compiler/mips/code-generator-mips.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 1419 matching lines @@
           __ sdc1(i.InputDoubleRegister(0), MemOperand(sp, i.InputInt32(1)));
         } else {
           DCHECK_EQ(MachineRepresentation::kFloat32, op->representation());
           __ swc1(i.InputSingleRegister(0), MemOperand(sp, i.InputInt32(1)));
         }
       } else {
         __ sw(i.InputRegister(0), MemOperand(sp, i.InputInt32(1)));
       }
       break;
     }
+    case kMipsByteSwap32: {
+      __ ByteSwapSigned(i.OutputRegister(0), i.InputRegister(0), 4);
+      break;
+    }
     case kCheckedLoadInt8:
       ASSEMBLE_CHECKED_LOAD_INTEGER(lb);
       break;
     case kCheckedLoadUint8:
       ASSEMBLE_CHECKED_LOAD_INTEGER(lbu);
       break;
     case kCheckedLoadInt16:
       ASSEMBLE_CHECKED_LOAD_INTEGER(lh);
       break;
     case kCheckedLoadUint16:
@@ skipping 736 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8