WIP: wasm oob trap handling experiments

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 1834 matching lines @@
   }
 
   static bool IsNop(Address addr);
 
   // Avoid overflows for displacements etc.
   static const int kMaximalBufferSize = 512*MB;
 
   byte byte_at(int pos)  { return buffer_[pos]; }
   void set_byte_at(int pos, byte value) { buffer_[pos] = value; }
 
+  Address GetPC() const { return pc_; }
+  void RecordRelocInfo(RelocInfo* rinfo);
+
  protected:
   // Call near indirect
   void call(const Operand& operand);
 
  private:
   byte* addr_at(int pos)  { return buffer_ + pos; }
   uint32_t long_at(int pos)  {
     return *reinterpret_cast<uint32_t*>(addr_at(pos));
   }
   void long_at_put(int pos, uint32_t x)  {
@@ skipping 485 matching lines @@
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_X64_ASSEMBLER_X64_H_