[interpreter] Filter expression positions at source.

src/interpreter/bytecode-peephole-optimizer.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-peephole-optimizer.h"
 
 #include "src/interpreter/constant-array-builder.h"
 #include "src/objects-inl.h"
 #include "src/objects.h"
 
@@ skipping 78 matching lines @@
 bool BytecodePeepholeOptimizer::LastBytecodePutsNameInAccumulator() const {
   DCHECK(LastIsValid());
   return (last_.bytecode() == Bytecode::kTypeOf ||
           last_.bytecode() == Bytecode::kToName ||
           (last_.bytecode() == Bytecode::kLdaConstant &&
            GetConstantForIndexOperand(&last_, 0)->IsName()));
 }
 
 void BytecodePeepholeOptimizer::TryToRemoveLastExpressionPosition(
     const BytecodeNode* const current) {
-  if (current->source_info().is_statement() &&
+  if (current->source_info().is_valid() &&
       last_.source_info().is_expression() &&
       Bytecodes::IsWithoutExternalSideEffects(last_.bytecode())) {
     // The last bytecode has been marked as expression. It has no
     // external effects so can't throw and the current bytecode is a
     // source position. Remove the expression position on the last
     // bytecode to open up potential peephole optimizations and to
     // save the memory and perf cost of storing the unneeded
     // expression position.
     last_.source_info().set_invalid();
   }
@@ skipping 206 matching lines @@
       next_stage_->Write(&last_);
       InvalidateLast();
     }
   }
   return current;
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8