Remove the fcontext field from all contexts.

src/contexts.cc

Index: src/contexts.cc
diff --git a/src/contexts.cc b/src/contexts.cc
index 4cc6222939962928a43600c062a37b240c1d0056..d066d347692931b887a1f767828293a0c2ab5d19 100644
--- a/src/contexts.cc
+++ b/src/contexts.cc
@@ -34,6 +34,16 @@
 namespace v8 {
 namespace internal {
 
+Context* Context::declaration_context() {
+  Context* current = this;
+  while (!current->IsFunctionContext() && !current->IsGlobalContext()) {
+    current = current->previous();
+    ASSERT(current->closure() == closure());
+  }
+  return current;
+}
+
+
 JSBuiltinsObject* Context::builtins() {
   GlobalObject* object = global();
   if (object->IsJSGlobalObject()) {
@@ -246,20 +256,22 @@ void Context::ComputeEvalScopeInfo(bool* outer_scope_calls_eval,
                                    bool* outer_scope_calls_non_strict_eval) {
   // Skip up the context chain checking all the function contexts to see
   // whether they call eval.
-  Context* context = fcontext();
+  Context* context = this;
   while (!context->IsGlobalContext()) {
-    Handle<SerializedScopeInfo> scope_info(
-        context->closure()->shared()->scope_info());
-    if (scope_info->CallsEval()) {
-      *outer_scope_calls_eval = true;
-      if (!scope_info->IsStrictMode()) {
-        // No need to go further since the answers will not change
-        // from here.
-        *outer_scope_calls_non_strict_eval = true;
-        return;
+    if (context->IsFunctionContext()) {
+      Handle<SerializedScopeInfo> scope_info(
+          context->closure()->shared()->scope_info());
+      if (scope_info->CallsEval()) {
+        *outer_scope_calls_eval = true;
+        if (!scope_info->IsStrictMode()) {
+          // No need to go further since the answers will not change from
+          // here.
+          *outer_scope_calls_non_strict_eval = true;
+          return;
+        }
       }
     }
-    context = context->previous()->fcontext();
+    context = context->previous();
   }
 }