Expose a lower bound of malloc'd memory via heap statistics

src/crankshaft/lithium-allocator.cc

Index: src/crankshaft/lithium-allocator.cc
diff --git a/src/crankshaft/lithium-allocator.cc b/src/crankshaft/lithium-allocator.cc
index 5d0529264207b6b7f3c1a7e5b3bf1d5bc2ede29a..6155dc0f2379344ef28e1aae27c504cb98e0a5fa 100644
--- a/src/crankshaft/lithium-allocator.cc
+++ b/src/crankshaft/lithium-allocator.cc
@@ -510,9 +510,9 @@ LifetimePosition LiveRange::FirstIntersection(LiveRange* other) {
   return LifetimePosition::Invalid();
 }
 
-
 LAllocator::LAllocator(int num_values, HGraph* graph)
-    : chunk_(NULL),
+    : zone_(graph->isolate()->allocator()),
+      chunk_(NULL),
       live_in_sets_(graph->blocks()->length(), zone()),
       live_ranges_(num_values * 2, zone()),
       fixed_live_ranges_(NULL),
@@ -529,7 +529,6 @@ LAllocator::LAllocator(int num_values, HGraph* graph)
       has_osr_entry_(false),
       allocation_ok_(true) {}
 
-
 void LAllocator::InitializeLivenessAnalysis() {
   // Initialize the live_in sets for each block to NULL.
   int block_count = graph_->blocks()->length();