Further refactoring of declarations in the AST:

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index ca3ab7851d39f69528d2291cf45c314f1bf4743a..3a9118f19100a83c95b95c332e54ccf783017909 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -417,8 +417,8 @@ bool Declaration::IsInlineable() const {
   return proxy()->var()->IsStackAllocated();
 }
 
-bool VariableDeclaration::IsInlineable() const {
-  return Declaration::IsInlineable() && fun() == NULL;
+bool FunctionDeclaration::IsInlineable() const {
+  return false;
 }
 
 
@@ -995,6 +995,7 @@ CaseClause::CaseClause(Isolate* isolate,
   }
 
 INCREASE_NODE_COUNT(VariableDeclaration)
+INCREASE_NODE_COUNT(FunctionDeclaration)
 INCREASE_NODE_COUNT(ModuleDeclaration)
 INCREASE_NODE_COUNT(ModuleLiteral)
 INCREASE_NODE_COUNT(ModuleVariable)