Devirtualize AstNode and subclasses, except for visiting-related methods.

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 697f97dda5e99dc37828c31794050f3a5a6dcb83..2f6ebcd6293a35f490ed726bd58411102fcc80aa 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -3531,7 +3531,7 @@ HBasicBlock* HOptimizedGraphBuilder::CreateJoin(HBasicBlock* first,
   }
 }
 
-
+template <class IterationStatement>
 HBasicBlock* HOptimizedGraphBuilder::JoinContinue(IterationStatement* statement,
                                                   HBasicBlock* exit_block,
                                                   HBasicBlock* continue_block) {
@@ -5084,7 +5084,7 @@ void HOptimizedGraphBuilder::VisitSwitchStatement(SwitchStatement* stmt) {
   }
 }
 
-
+template <class IterationStatement>
 void HOptimizedGraphBuilder::VisitLoopBody(IterationStatement* stmt,
                                            HBasicBlock* loop_entry) {
   Add<HSimulate>(stmt->StackCheckId());
@@ -6697,6 +6697,7 @@ void HOptimizedGraphBuilder::HandlePolymorphicNamedFieldAccess(
   }
 }
 
+template <class Expression>
 static bool ComputeReceiverTypes(Expression* expr, HValue* receiver,
                                  SmallMapList** t,
                                  HOptimizedGraphBuilder* builder) {
@@ -6750,7 +6751,7 @@ static bool AreStringTypes(SmallMapList* maps) {
   return true;
 }
 
-
+template <class Expression>
 void HOptimizedGraphBuilder::BuildStore(Expression* expr, Property* prop,
                                         FeedbackVectorSlot slot,
                                         BailoutId ast_id, BailoutId return_id,
@@ -7583,7 +7584,7 @@ HValue* HOptimizedGraphBuilder::HandlePolymorphicElementAccess(
   return access_type == STORE ? val : Pop();
 }
 
-
+template <class Expression>
 HValue* HOptimizedGraphBuilder::HandleKeyedElementAccess(
     HValue* obj, HValue* key, HValue* val, Expression* expr,
     FeedbackVectorSlot slot, BailoutId ast_id, BailoutId return_id,
@@ -7796,7 +7797,7 @@ bool HOptimizedGraphBuilder::TryArgumentsAccess(Property* expr) {
   return true;
 }
 
-
+template <class Expression>
 HValue* HOptimizedGraphBuilder::BuildNamedAccess(
     PropertyAccessType access, BailoutId ast_id, BailoutId return_id,
     Expression* expr, FeedbackVectorSlot slot, HValue* object,
@@ -10702,7 +10703,7 @@ HInstruction* HOptimizedGraphBuilder::BuildIncrement(
   return instr;
 }
 
-
+template <class Expression>
 void HOptimizedGraphBuilder::BuildStoreForEffect(
     Expression* expr, Property* prop, FeedbackVectorSlot slot, BailoutId ast_id,
     BailoutId return_id, HValue* object, HValue* key, HValue* value) {