Cleaning up usage of lookup results.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 33cbb8149f7dc41b8499df044126c19c939603f6..b67deae0d82758f8f6ca49b0a5769012dcffe7df 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1080,11 +1080,11 @@ bool Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
 #ifdef DEBUG
     LookupResult lookup(isolate);
     result->LocalLookup(heap->callee_symbol(), &lookup);
-    ASSERT(lookup.IsFound() && (lookup.type() == FIELD));
+    ASSERT(lookup.IsField());
     ASSERT(lookup.GetFieldIndex() == Heap::kArgumentsCalleeIndex);
 
     result->LocalLookup(heap->length_symbol(), &lookup);
-    ASSERT(lookup.IsFound() && (lookup.type() == FIELD));
+    ASSERT(lookup.IsField());
     ASSERT(lookup.GetFieldIndex() == Heap::kArgumentsLengthIndex);
 
     ASSERT(result->map()->inobject_properties() > Heap::kArgumentsCalleeIndex);
@@ -1178,7 +1178,7 @@ bool Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
 #ifdef DEBUG
     LookupResult lookup(isolate);
     result->LocalLookup(heap->length_symbol(), &lookup);
-    ASSERT(lookup.IsFound() && (lookup.type() == FIELD));
+    ASSERT(lookup.IsField());
     ASSERT(lookup.GetFieldIndex() == Heap::kArgumentsLengthIndex);
 
     ASSERT(result->map()->inobject_properties() > Heap::kArgumentsLengthIndex);