[compiler] Whenever we want source positions, record that in the CompilationInfo.

src/compilation-info.cc

 // Copyright 2016 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/compilation-info.h"
 
 #include "src/api.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/isolate.h"
@@ skipping 47 matching lines @@
 
   // Compiling for the snapshot typically results in different code than
   // compiling later on. This means that code recompiled with deoptimization
   // support won't be "equivalent" (as defined by SharedFunctionInfo::
   // EnableDeoptimizationSupport), so it will replace the old code and all
   // its type feedback. To avoid this, always compile functions in the snapshot
   // with deoptimization support.
   if (isolate_->serializer_enabled()) EnableDeoptimizationSupport();
 
   if (FLAG_function_context_specialization) MarkAsFunctionContextSpecializing();
-  if (FLAG_turbo_source_positions) MarkAsSourcePositionsEnabled();
   if (FLAG_turbo_splitting) MarkAsSplittingEnabled();
+
+  if (FLAG_trace_deopt || FLAG_trace_turbo || FLAG_trace_turbo_graph ||
+      FLAG_turbo_profiling || isolate_->is_profiling()) {
+    MarkAsSourcePositionsEnabled();
+  }
 }
 
 CompilationInfo::CompilationInfo(Vector<const char> debug_name,
                                  Isolate* isolate, Zone* zone,
                                  Code::Flags code_flags)
     : CompilationInfo(nullptr, debug_name, code_flags, STUB, isolate, zone) {}
 
 CompilationInfo::CompilationInfo(ParseInfo* parse_info,
                                  Vector<const char> debug_name,
                                  Code::Flags code_flags, Mode mode,
@@ skipping 139 matching lines @@
   inlined_functions_.push_back(InlinedFunctionHolder(
       inlined_function, handle(inlined_function->code())));
 }
 
 Code::Kind CompilationInfo::output_code_kind() const {
   return Code::ExtractKindFromFlags(code_flags_);
 }
 
 }  // namespace internal
 }  // namespace v8