Support old-space allocation in generated code (bump block only for now).

runtime/vm/heap.cc

Index: runtime/vm/heap.cc
===================================================================
--- runtime/vm/heap.cc	(revision 40518)
+++ runtime/vm/heap.cc	(working copy)
@@ -38,6 +38,7 @@
             "Enables heap verification after GC.");
 DEFINE_FLAG(bool, verify_before_gc, false,
             "Enables heap verification before GC.");
+DEFINE_FLAG(bool, pretenure_all, false, "Global pretenuring (for testing).");
 
 
 Heap::Heap(Isolate* isolate,
@@ -404,16 +405,31 @@
 }
 
 
-uword Heap::TopAddress() {
-  return reinterpret_cast<uword>(new_space_->TopAddress());
+uword Heap::TopAddress(Heap::Space space) {
+  if (space == kNew) {
+    return reinterpret_cast<uword>(new_space_->TopAddress());
+  } else {
+    ASSERT(space == kPretenured);
+    return reinterpret_cast<uword>(old_space_->TopAddress());
+  }
 }
 
 
-uword Heap::EndAddress() {
-  return reinterpret_cast<uword>(new_space_->EndAddress());
+uword Heap::EndAddress(Heap::Space space) {
+  if (space == kNew) {
+    return reinterpret_cast<uword>(new_space_->EndAddress());
+  } else {
+    ASSERT(space == kPretenured);
+    return reinterpret_cast<uword>(old_space_->EndAddress());
+  }
 }
 
 
+Heap::Space Heap::SpaceForAllocation(intptr_t cid) const {
+  return FLAG_pretenure_all ? kPretenured : kNew;
+}
+
+
 void Heap::Init(Isolate* isolate,
                 intptr_t max_new_gen_words,
                 intptr_t max_old_gen_words) {