Respect old space allocation limit in PagedSpace::AllocateRaw.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 054ebced2a899ff2d20941a4d4b76638de122f8a..fe02f3167f43c0b105a01b2b254570ea6ba7e78e 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1867,6 +1867,10 @@ class NewSpaceScavenger : public StaticNewSpaceVisitor<NewSpaceScavenger> {
 
 Address Heap::DoScavenge(ObjectVisitor* scavenge_visitor,
                          Address new_space_front) {
+  // There are soft limits in the allocation code, designed trigger a mark
+  // sweep collection by failing allocations. There is no sense in trying to

[Hannes Payer (out of office), 2015/03/20 12:29:27]

designed to...
For scavenges allocation should always succeed.

+  // trigger one in during scavenge.
+  AlwaysAllocateScope scope(isolate());
   do {
     SemiSpace::AssertValidRange(new_space_front, new_space_.top());
     // The addresses new_space_front and new_space_.top() define a