[interpreter] Fix source position of yield-exceptions in generators.

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/bytecode-array-writer.h"
 #include "src/interpreter/bytecode-peephole-optimizer.h"
 #include "src/interpreter/interpreter-intrinsics.h"
@@ skipping 742 matching lines @@
 
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::ReThrow() {
   Output(Bytecode::kReThrow);
   exit_seen_in_block_ = true;
   return *this;
 }
 
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::Return() {
-  SetReturnPosition();
   Output(Bytecode::kReturn);
   exit_seen_in_block_ = true;
   return *this;
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::Debugger() {
   Output(Bytecode::kDebugger);
   return *this;
 }
 
@@ skipping 83 matching lines @@
 
 
 void BytecodeArrayBuilder::LeaveBasicBlock() {
   exit_seen_in_block_ = false;
   pipeline()->FlushBasicBlock();
 }
 
 void BytecodeArrayBuilder::EnsureReturn() {
   if (!exit_seen_in_block_) {
     LoadUndefined();
+    SetReturnPosition();
     Return();
   }
   DCHECK(exit_seen_in_block_);
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::Call(Register callable,
                                                  Register receiver_args,
                                                  size_t receiver_args_count,
                                                  int feedback_slot,
                                                  TailCallMode tail_call_mode) {
@@ skipping 407 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