[interpreter] statement position always overwrites earlier positions.

src/interpreter/bytecode-array-builder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/compiler.h"
 #include "src/interpreter/interpreter-intrinsics.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 1057 matching lines @@
   return *this;
 }
 
 size_t BytecodeArrayBuilder::GetConstantPoolEntry(Handle<Object> object) {
   return constant_array_builder()->Insert(object);
 }
 
 void BytecodeArrayBuilder::SetReturnPosition() {
   if (return_position_ == RelocInfo::kNoPosition) return;
   if (exit_seen_in_block_) return;
-  source_position_table_builder_.AddStatementPosition(
-      bytecodes_.size(), return_position_,
-      SourcePositionTableBuilder::OVERWRITE_DUPLICATE);
+  source_position_table_builder_.AddStatementPosition(bytecodes_.size(),
+                                                      return_position_);
 }
 
 void BytecodeArrayBuilder::SetStatementPosition(Statement* stmt) {
   if (stmt->position() == RelocInfo::kNoPosition) return;
   if (exit_seen_in_block_) return;
   source_position_table_builder_.AddStatementPosition(bytecodes_.size(),
                                                       stmt->position());
 }
 
 void BytecodeArrayBuilder::SetExpressionPosition(Expression* expr) {
@@ skipping 394 matching lines @@
 }
 
 uint32_t BytecodeArrayBuilder::UnsignedOperand(size_t value) {
   DCHECK_LE(value, kMaxUInt32);
   return static_cast<uint32_t>(value);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8