[x64] Fix strict aliasing error with GCC.

src/x64/assembler-x64.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/x64/assembler-x64.h"
 
 #include <cstring>
 
 #if V8_TARGET_ARCH_X64
 
@@ skipping 467 matching lines @@
   const unsigned length = adr.len_;
   DCHECK(length > 0);
 
   // Emit updated ModR/M byte containing the given register.
   DCHECK((adr.buf_[0] & 0x38) == 0);
   *pc_++ = adr.buf_[0] | code << 3;
 
   // Recognize RIP relative addressing.
   if (adr.buf_[0] == 5) {
     DCHECK_EQ(9u, length);
-    Label* label = *reinterpret_cast<Label* const*>(&adr.buf_[1]);
+    Label* label = *bit_cast<Label* const*>(&adr.buf_[1]);
     if (label->is_bound()) {
       int offset = label->pos() - pc_offset() - sizeof(int32_t);
       DCHECK_GE(0, offset);
       emitl(offset);
     } else if (label->is_linked()) {
       emitl(label->pos());
       label->link_to(pc_offset() - sizeof(int32_t));
     } else {
       DCHECK(label->is_unused());
       int32_t current = pc_offset();
@@ skipping 2988 matching lines @@
 
 
 bool RelocInfo::IsInConstantPool() {
   return false;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64