Continued fix for 351257. Reusing the feedback vector is too complex.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index fdee097b438e4d07bf20f2e350664d6c5a0df976..69b794d5c6322626fa01ba80da7d533b7fecc577 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -249,6 +249,17 @@ void CompilationInfo::PrepareForCompilation(Scope* scope) {
   ASSERT(scope_ == NULL);
   scope_ = scope;
   function()->ProcessFeedbackSlots(isolate_);
+  int length = function()->slot_count();
+  // Allocate the feedback vector too.
+  feedback_vector_ = isolate()->factory()->NewFixedArray(length, TENURED);
+  // Ensure we can skip the write barrier
+  ASSERT_EQ(isolate()->heap()->uninitialized_symbol(),
+            *TypeFeedbackInfo::UninitializedSentinel(isolate()));
+  for (int i = 0; i < length; i++) {
+    feedback_vector_->set(i,
+        *TypeFeedbackInfo::UninitializedSentinel(isolate()),
+        SKIP_WRITE_BARRIER);
+  }
 }
 
 
@@ -570,6 +581,8 @@ static void UpdateSharedFunctionInfo(CompilationInfo* info) {
   shared->ReplaceCode(*code);
   if (shared->optimization_disabled()) code->set_optimizable(false);
 
+  shared->set_feedback_vector(*info->feedback_vector());
+
   // Set the expected number of properties for instances.
   FunctionLiteral* lit = info->function();
   int expected = lit->expected_property_count();
@@ -823,7 +836,8 @@ static Handle<SharedFunctionInfo> CompileToplevel(CompilationInfo* info) {
         lit->materialized_literal_count(),
         lit->is_generator(),
         info->code(),
-        ScopeInfo::Create(info->scope(), info->zone()));
+        ScopeInfo::Create(info->scope(), info->zone()),
+        info->feedback_vector());
 
     ASSERT_EQ(RelocInfo::kNoPosition, lit->function_token_position());
     SetFunctionInfo(result, lit, true, script);
@@ -1022,7 +1036,8 @@ Handle<SharedFunctionInfo> Compiler::BuildFunctionInfo(FunctionLiteral* literal,
                                      literal->materialized_literal_count(),
                                      literal->is_generator(),
                                      info.code(),
-                                     scope_info);
+                                     scope_info,
+                                     info.feedback_vector());
   SetFunctionInfo(result, literal, false, script);
   RecordFunctionCompilation(Logger::FUNCTION_TAG, &info, result);
   result->set_allows_lazy_compilation(allow_lazy);