Make compilers agree on source position of thrown errors.

src/assembler.cc

 // 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 1597 matching lines @@
 
 bool PositionsRecorder::WriteRecordedPositions() {
   bool written = false;
 
   // Write the statement position if it is different from what was written last
   // time.
   if (state_.current_statement_position != state_.written_statement_position) {
     EnsureSpace ensure_space(assembler_);
     assembler_->RecordRelocInfo(RelocInfo::STATEMENT_POSITION,
                                 state_.current_statement_position);
-    state_.written_statement_position = state_.current_statement_position;
     written = true;
   }
+  state_.written_statement_position = state_.current_statement_position;
 
   // Write the position if it is different from what was written last time and
-  // also different from the written statement position.
+  // also different from the statement position that was just written.
   if (state_.current_position != state_.written_position &&
-      state_.current_position != state_.written_statement_position) {
+      (state_.current_position != state_.written_statement_position ||
+       !written)) {
     EnsureSpace ensure_space(assembler_);
     assembler_->RecordRelocInfo(RelocInfo::POSITION, state_.current_position);
-    state_.written_position = state_.current_position;
     written = true;
   }
+  state_.written_position = state_.current_position;
 
   // Return whether something was written.
   return written;
 }
 
 
 // Platform specific but identical code for all the platforms.
 
 
 void Assembler::RecordDeoptReason(const int reason,
@@ skipping 21 matching lines @@
   RecordRelocInfo(RelocInfo::JS_RETURN);
 }
 
 
 void Assembler::RecordDebugBreakSlot() {
   positions_recorder()->WriteRecordedPositions();
   EnsureSpace ensure_space(this);
   RecordRelocInfo(RelocInfo::DEBUG_BREAK_SLOT);
 }
 } }  // namespace v8::internal