Canonicalize handles for optimized compilation.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 067d46be1a1baf3073b7d0ae5d4d420c8254a6c4..9730f576297ddd2eaf3e944e0b3dbd4a189e621f 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -863,9 +863,12 @@ bool Compiler::ParseAndAnalyze(ParseInfo* info) {
 
 
 static bool GetOptimizedCodeNow(CompilationInfo* info) {
+  Isolate* isolate = info->isolate();
+  CanonicalHandleScope canonical(isolate);
+
   if (!Compiler::ParseAndAnalyze(info->parse_info())) return false;
 
-  TimerEventScope<TimerEventRecompileSynchronous> timer(info->isolate());
+  TimerEventScope<TimerEventRecompileSynchronous> timer(isolate);
 
   OptimizedCompileJob job(info);
   if (job.CreateGraph() != OptimizedCompileJob::SUCCEEDED ||
@@ -880,7 +883,7 @@ static bool GetOptimizedCodeNow(CompilationInfo* info) {
   }
 
   // Success!
-  DCHECK(!info->isolate()->has_pending_exception());
+  DCHECK(!isolate->has_pending_exception());
   InsertCodeIntoOptimizedCodeMap(info);
   RecordFunctionCompilation(Logger::LAZY_COMPILE_TAG, info,
                             info->shared_info());
@@ -890,6 +893,8 @@ static bool GetOptimizedCodeNow(CompilationInfo* info) {
 
 static bool GetOptimizedCodeLater(CompilationInfo* info) {
   Isolate* isolate = info->isolate();
+  CanonicalHandleScope canonical(isolate);
+
   if (!isolate->optimizing_compile_dispatcher()->IsQueueAvailable()) {
     if (FLAG_trace_concurrent_recompilation) {
       PrintF("  ** Compilation queue full, will retry optimizing ");