[turbofan] Use StdoutStream instead of std::cout in broker/serializer.

Bug: v8:7790
Change-Id: I25e41548c526e93c5b0a532ca2d270b62193a557
Reviewed-on: https://chromium-review.googlesource.com/c/1448315
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59336}

src/compiler/js-heap-broker.cc

@@ -1580,9 +1580,9 @@ JSHeapBroker::JSHeapBroker(Isolate* isolate, Zone* broker_zone)
   TRACE(this, "Constructing heap broker.");
 }
 
-std::ostream& JSHeapBroker::Trace() const {
-  std::cout << "[" << this << "] " << std::string(trace_indentation_ * 2, ' ');
-  return std::cout;
+std::ostream& JSHeapBroker::Trace() {
+  return trace_out_ << "[" << this << "] "
+                    << std::string(trace_indentation_ * 2, ' ');
 }
 
 void JSHeapBroker::StartSerializing() {

src/compiler/js-heap-broker.h

@@ -14,6 +14,7 @@
 #include "src/objects.h"
 #include "src/objects/builtin-function-id.h"
 #include "src/objects/instance-type.h"
+#include "src/ostreams.h"
 #include "src/zone/zone-containers.h"
 
 namespace v8 {
@@ -642,7 +643,7 @@ class V8_EXPORT_PRIVATE JSHeapBroker : public NON_EXPORTED_BASE(ZoneObject) {
   // %ObjectPrototype%.
   bool IsArrayOrObjectPrototype(const JSObjectRef& object) const;
 
-  std::ostream& Trace() const;
+  std::ostream& Trace();
 
   void IncrementTracingIndentation();
   void DecrementTracingIndentation();
@@ -663,8 +664,8 @@ class V8_EXPORT_PRIVATE JSHeapBroker : public NON_EXPORTED_BASE(ZoneObject) {
   ZoneUnorderedSet<Handle<JSObject>, Handle<JSObject>::hash,
                    Handle<JSObject>::equal_to>
       array_and_object_prototypes_;
-
   BrokerMode mode_ = kDisabled;
+  StdoutStream trace_out_;
   unsigned trace_indentation_ = 0;
   PerIsolateCompilerCache* compiler_cache_;
 

src/objects.cc

@@ -5069,7 +5069,8 @@ Handle<Object> SharedFunctionInfo::GetSourceCodeHarmony(
 namespace {
 void TraceInlining(SharedFunctionInfo shared, const char* msg) {
   if (FLAG_trace_turbo_inlining) {
-    std::cout << Brief(shared) << ": IsInlineable? " << msg << "\n";
+    StdoutStream os;
+    os << Brief(shared) << ": IsInlineable? " << msg << "\n";
   }
 }
 }  // namespace