Fix full code generator to not use --debug-code if it is in

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 543 matching lines @@
   // If the provided buffer is not NULL, the assembler uses the provided buffer
   // for code generation and assumes its size to be buffer_size. If the buffer
   // is too small, a fatal error occurs. No deallocation of the buffer is done
   // upon destruction of the assembler.
   Assembler(Isolate* isolate, void* buffer, int buffer_size);
   ~Assembler();
 
   // Overrides the default provided by FLAG_debug_code.
   void set_emit_debug_code(bool value) { emit_debug_code_ = value; }
 
+  // Avoids using instructions that vary in size in unpredictable ways between
+  // the snapshot and the running VM.  This is needed by the full compiler so
+  // that it can recompile code with debug support and fix the PC.
+  void set_predictable_code_size(bool value) { predictable_code_size_ = value; }
+
   // GetCode emits any pending (non-emitted) code and fills the descriptor
   // desc. GetCode() is idempotent; it returns the same result if no other
   // Assembler functions are invoked in between GetCode() calls.
   void GetCode(CodeDesc* desc);
 
   // Read/Modify the code target in the relative branch/call instruction at pc.
   // On the x64 architecture, we use relative jumps with a 32-bit displacement
   // to jump to other Code objects in the Code space in the heap.
   // Jumps to C functions are done indirectly through a 64-bit register holding
   // the absolute address of the target.
@@ skipping 852 matching lines @@
 
   // Avoid overflows for displacements etc.
   static const int kMaximalBufferSize = 512*MB;
   static const int kMinimalBufferSize = 4*KB;
 
   byte byte_at(int pos)  { return buffer_[pos]; }
   void set_byte_at(int pos, byte value) { buffer_[pos] = value; }
 
  protected:
   bool emit_debug_code() const { return emit_debug_code_; }
+  bool predictable_code_size() const { return predictable_code_size_; }
 
  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)  {
     *reinterpret_cast<uint32_t*>(addr_at(pos)) = x;
   }
 
@@ skipping 184 matching lines @@
 
   // code generation
   byte* pc_;  // the program counter; moves forward
   RelocInfoWriter reloc_info_writer;
 
   List< Handle<Code> > code_targets_;
 
   PositionsRecorder positions_recorder_;
 
   bool emit_debug_code_;
+  bool predictable_code_size_;
 
   friend class PositionsRecorder;
 };
 
 
 // Helper class that ensures that there is enough space for generating
 // instructions and relocation information.  The constructor makes
 // sure that there is enough space and (in debug mode) the destructor
 // checks that we did not generate too much.
 class EnsureSpace BASE_EMBEDDED {
@@ skipping 15 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_