Debugger: use debug break slots instead of ICs (except for calls).

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index 91577c69723f42da63311f16a0678c047b523f84..e6aaa914bfe308e290f60f79718d3d750d9b005d 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -1617,20 +1617,19 @@ bool PositionsRecorder::WriteRecordedPositions() {
     EnsureSpace ensure_space(assembler_);
     assembler_->RecordRelocInfo(RelocInfo::STATEMENT_POSITION,
                                 state_.current_statement_position);
+    state_.written_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 statement position that was just written.
-  if (state_.current_position != state_.written_position &&
-      (state_.current_position != state_.written_statement_position ||
-       !written)) {
+  if (state_.current_position != state_.written_position) {
     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;
@@ -1869,7 +1868,6 @@ void Assembler::RecordJSReturn() {
 
 
 void Assembler::RecordDebugBreakSlot() {
-  positions_recorder()->WriteRecordedPositions();
   EnsureSpace ensure_space(this);
   RecordRelocInfo(RelocInfo::DEBUG_BREAK_SLOT);
 }