Refactored the recording of source position in the generated code. The code g...

src/assembler-ia32.h

Index: src/assembler-ia32.h
===================================================================
--- src/assembler-ia32.h	(revision 958)
+++ src/assembler-ia32.h	(working copy)
@@ -707,8 +707,8 @@
   void WriteInternalReference(int position, const Label& bound_label);
 
   int pc_offset() const  { return pc_ - buffer_; }
-  int last_statement_position() const  { return last_statement_position_; }
-  int last_position() const  { return last_position_; }
+  int current_statement_position() const { return current_statement_position_; }
+  int current_position() const  { return current_position_; }
 
   // Check if there is less than kGap bytes available in the buffer.
   // If this is the case, we need to grow the buffer before emitting
@@ -746,8 +746,10 @@
   byte* last_pc_;
 
   // source position information
-  int last_position_;
-  int last_statement_position_;
+  int current_statement_position_;
+  int current_position_;
+  int written_statement_position_;
+  int written_position_;
 
   byte* addr_at(int pos)  { return buffer_ + pos; }
   byte byte_at(int pos)  { return buffer_[pos]; }