Implement WASM big-endian support

src/compiler/wasm-compiler.h

 // Copyright 2015 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.
 
 #ifndef V8_COMPILER_WASM_COMPILER_H_
 #define V8_COMPILER_WASM_COMPILER_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/compiler.h"
@@ skipping 216 matching lines @@
   Node* GetUnalignedLoadOffsetNode(Node* baseOffset, int numberOfBytes,
                                    int stride, int current);
 
   Node* BuildUnalignedLoad(wasm::LocalType type, MachineType memtype,
                            Node* index, uint32_t offset, uint32_t alignment);
   Node* GetUnalignedStoreOffsetNode(Node* baseOffset, int numberOfBytes,
                                     int stride, int current);
   Node* BuildUnalignedStore(MachineType memtype, Node* index, uint32_t offset,
                             uint32_t alignment, Node* val);
 
+  Node* BuildChangeEndianness(Node* node, MachineType type,
+                              wasm::LocalType wasmtype = wasm::kAstStmt);
+
   Node* MaskShiftCount32(Node* node);
   Node* MaskShiftCount64(Node* node);
 
   Node* BuildCCall(MachineSignature* sig, Node** args);
   Node* BuildWasmCall(wasm::FunctionSig* sig, Node** args,
                       wasm::WasmCodePosition position);
 
   Node* BuildF32Neg(Node* input);
   Node* BuildF64Neg(Node* input);
   Node* BuildF32CopySign(Node* left, Node* right);
@@ skipping 98 matching lines @@
     Node** buf = Buffer(new_count);
     if (buf != buffer) memcpy(buf, buffer, old_count * sizeof(Node*));
     return buf;
   }
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_WASM_COMPILER_H_