Revert of Implement WASM big-endian support

test/cctest/wasm/wasm-run-utils.h

 // Copyright 2016 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 WASM_RUN_UTILS_H
 #define WASM_RUN_UTILS_H
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 122 matching lines @@
 
   template <typename T>
   T* raw_mem_end() {
     DCHECK(instance->mem_start);
     return reinterpret_cast<T*>(instance->mem_start + instance->mem_size);
   }
 
   template <typename T>
   T raw_mem_at(int i) {
     DCHECK(instance->mem_start);
-    return ReadMemory(&(reinterpret_cast<T*>(instance->mem_start)[i]));
+    return reinterpret_cast<T*>(instance->mem_start)[i];
   }
 
   template <typename T>
   T raw_val_at(int i) {
-    return ReadMemory(reinterpret_cast<T*>(instance->mem_start + i));
-  }
-
-  template <typename T>
-  void WriteMemory(T* p, T val) {
-    WriteLittleEndianValue<T>(p, val);
-  }
-
-  template <typename T>
-  T ReadMemory(T* p) {
-    return ReadLittleEndianValue<T>(p);
+    T val;
+    memcpy(&val, reinterpret_cast<void*>(instance->mem_start + i), sizeof(T));
+    return val;
   }
 
   // Zero-initialize the memory.
   void BlankMemory() {
     byte* raw = raw_mem_start<byte>();
     memset(raw, 0, instance->mem_size);
   }
 
   // Pseudo-randomly intialize the memory.
   void RandomizeMemory(unsigned int seed = 88) {
@@ skipping 594 matching lines @@
 // interpreter.
 #define WASM_EXEC_TEST(name)                                               \
   void RunWasm_##name(WasmExecutionMode execution_mode);                   \
   TEST(RunWasmCompiled_##name) { RunWasm_##name(kExecuteCompiled); }       \
   TEST(RunWasmInterpreted_##name) { RunWasm_##name(kExecuteInterpreted); } \
   void RunWasm_##name(WasmExecutionMode execution_mode)
 
 }  // namespace
 
 #endif