Implement many KeyedStoreStubs using Crankshaft

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 5b4c55c3a78a252502419ac979cf36dca969e0bc..f2f6c06916d547f27903b3967b7373063cc1d65c 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -520,6 +520,7 @@ class Heap {
   int InitialSemiSpaceSize() { return initial_semispace_size_; }
   intptr_t MaxOldGenerationSize() { return max_old_generation_size_; }
   intptr_t MaxExecutableSize() { return max_executable_size_; }
+  int MaxNewSpaceAllocationSize() { return InitialSemiSpaceSize() * 3/4; }
 
   // Returns the capacity of the heap in bytes w/o growing. Heap grows when
   // more spaces are needed until it reaches the limit.