[debugger] omit exception events for rethrown exceptions in async.

src/interpreter/bytecode-array-builder.cc

Index: src/interpreter/bytecode-array-builder.cc
diff --git a/src/interpreter/bytecode-array-builder.cc b/src/interpreter/bytecode-array-builder.cc
index 8dc4fb98985bddb9e5328b622f7ab808ef3789b1..b15c55269dc192560253371f1a44b95f4e5ff69e 100644
--- a/src/interpreter/bytecode-array-builder.cc
+++ b/src/interpreter/bytecode-array-builder.cc
@@ -30,6 +30,7 @@ BytecodeArrayBuilder::BytecodeArrayBuilder(Isolate* isolate, Zone* zone,
       parameter_count_(parameter_count),
       local_register_count_(locals_count),
       context_register_count_(context_count),
+      literal_(literal),
       temporary_allocator_(zone, fixed_register_count()),
       bytecode_array_writer_(isolate, zone, &constant_array_builder_),
       pipeline_(&bytecode_array_writer_) {
@@ -50,10 +51,6 @@ BytecodeArrayBuilder::BytecodeArrayBuilder(Isolate* isolate, Zone* zone,
     pipeline_ = new (zone) BytecodeRegisterOptimizer(
         zone, &temporary_allocator_, parameter_count, pipeline_);
   }
-
-  return_position_ =
-      literal ? std::max(literal->start_position(), literal->end_position() - 1)
-              : kNoSourcePosition;
 }
 
 Register BytecodeArrayBuilder::first_context_register() const {
@@ -632,8 +629,10 @@ size_t BytecodeArrayBuilder::GetConstantPoolEntry(Handle<Object> object) {
 }
 
 void BytecodeArrayBuilder::SetReturnPosition() {
-  if (return_position_ == kNoSourcePosition) return;
-  latest_source_info_.MakeStatementPosition(return_position_);
+  if (literal_ == nullptr) return;
+  int position =
+      std::max(literal_->start_position(), literal_->end_position() - 1);
+  latest_source_info_.MakeStatementPosition(position);
 }
 
 void BytecodeArrayBuilder::SetStatementPosition(Statement* stmt) {