Improve positions tracking inside the HGraphBuilder.

src/lithium-codegen.cc

 // Copyright 2013 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 89 matching lines @@
     if (FLAG_code_comments && instr->HasInterestingComment(codegen)) {
       Comment(";;; <@%d,#%d> %s",
               current_instruction_,
               instr->hydrogen_value()->id(),
               instr->Mnemonic());
     }
 
     GenerateBodyInstructionPre(instr);
 
     HValue* value = instr->hydrogen_value();
-    if (value->position() != RelocInfo::kNoPosition) {
-      ASSERT(!graph()->info()->IsOptimizing() ||
-             !FLAG_emit_opt_code_positions ||
-             value->position() != RelocInfo::kNoPosition);
-      RecordAndWritePosition(value->position());
+    if (!value->position().IsUnknown()) {
+      RecordAndWritePosition(
+        chunk()->graph()->SourcePositionToScriptPosition(value->position()));
     }
 
     instr->CompileToNative(codegen);
 
     GenerateBodyInstructionPost(instr);
   }
   EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
   last_lazy_deopt_pc_ = masm()->pc_offset();
   return !is_aborted();
 }
@@ skipping 63 matching lines @@
   for (int i = 0; i < objects.length(); i++) {
     AddWeakObjectToCodeDependency(isolate()->heap(), objects.at(i), code);
   }
   for (int i = 0; i < cells.length(); i++) {
     AddWeakObjectToCodeDependency(isolate()->heap(), cells.at(i), code);
   }
 }
 
 
 } }  // namespace v8::internal