Refactoring: Make predictable code flag handling architecture-independent.

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index cd10d723ffcd4ad549852865f8b8b1bceaa4c00c..f77be7a9d0f7c3c2de60bb028c2170e74eb54a7d 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -561,11 +561,6 @@ class Assembler : public AssemblerBase {
   // 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.
@@ -1451,7 +1446,6 @@ class Assembler : public AssemblerBase {
 
  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; }
@@ -1656,7 +1650,6 @@ class Assembler : public AssemblerBase {
   PositionsRecorder positions_recorder_;
 
   bool emit_debug_code_;
-  bool predictable_code_size_;
 
   friend class PositionsRecorder;
 };