Revert "Remove V8_HOST_CAN_READ_UNALIGNED and its uses."

src/regexp-macro-assembler.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/assembler.h"
 #include "src/ast.h"
 #include "src/regexp-macro-assembler.h"
 #include "src/regexp-stack.h"
 #include "src/simulator.h"
 
 namespace v8 {
 namespace internal {
 
 RegExpMacroAssembler::RegExpMacroAssembler(Zone* zone)
   : slow_safe_compiler_(false),
     global_mode_(NOT_GLOBAL),
     zone_(zone) {
 }
 
 
 RegExpMacroAssembler::~RegExpMacroAssembler() {
 }
 
 
+bool RegExpMacroAssembler::CanReadUnaligned() {
+#ifdef V8_HOST_CAN_READ_UNALIGNED
+  return true;
+#else
+  return false;
+#endif
+}
+
+
 #ifndef V8_INTERPRETED_REGEXP  // Avoid unused code, e.g., on ARM.
 
 NativeRegExpMacroAssembler::NativeRegExpMacroAssembler(Zone* zone)
     : RegExpMacroAssembler(zone) {
 }
 
 
 NativeRegExpMacroAssembler::~NativeRegExpMacroAssembler() {
 }
 
@@ skipping 212 matching lines @@
     return NULL;
   }
   *stack_base = new_stack_base;
   intptr_t stack_content_size = old_stack_base - stack_pointer;
   return new_stack_base - stack_content_size;
 }
 
 #endif  // V8_INTERPRETED_REGEXP
 
 } }  // namespace v8::internal