More work for background compilation; move pending_functions_ from ObjectStore to Thread.

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index 94875a6b396097937e68d5d385f4aa508c38e3f5..15d13ff57e91c18e16b2249b4439893d590fe8a2 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -384,7 +384,7 @@ Parser::Parser(const Script& script,
 Parser::~Parser() {
   if (unregister_pending_function_) {
     const GrowableObjectArray& pending_functions =
-        GrowableObjectArray::Handle(I->object_store()->pending_functions());
+        GrowableObjectArray::Handle(T->pending_functions());
     ASSERT(pending_functions.Length() > 0);
     ASSERT(pending_functions.At(pending_functions.Length()-1) ==
         current_function().raw());
@@ -2931,8 +2931,7 @@ SequenceNode* Parser::MakeImplicitConstructor(const Function& func) {
 
 void Parser::CheckRecursiveInvocation() {
   const GrowableObjectArray& pending_functions =
-      GrowableObjectArray::Handle(Z,
-          I->object_store()->pending_functions());
+      GrowableObjectArray::Handle(Z, T->pending_functions());
   for (int i = 0; i < pending_functions.Length(); i++) {
     if (pending_functions.At(i) == current_function().raw()) {
       const String& fname =