Improve error message when zone allocation fails.

runtime/vm/zone.cc

Index: runtime/vm/zone.cc
diff --git a/runtime/vm/zone.cc b/runtime/vm/zone.cc
index 0f6754fd15f1a4615c596cd56ae1502c3ebac002..743727a54f91a3abffc9b8b9efb41a1798ae8620 100644
--- a/runtime/vm/zone.cc
+++ b/runtime/vm/zone.cc
@@ -35,7 +35,7 @@ class Zone::Segment {
   // Computes the address of the nth byte in this segment.
   uword address(int n) { return reinterpret_cast<uword>(this) + n; }
 
-  static void Delete(Segment* segment) { delete[] segment; }
+  static void Delete(Segment* segment) { free(segment); }
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Segment);
 };
@@ -57,16 +57,17 @@ void Zone::Segment::DeleteSegmentList(Segment* head) {
 
 Zone::Segment* Zone::Segment::New(intptr_t size, Zone::Segment* next) {
   ASSERT(size >= 0);
-  Segment* result = reinterpret_cast<Segment*>(new uint8_t[size]);
+  Segment* result = reinterpret_cast<Segment*>(malloc(size));
+  if (result == NULL) {
+    FATAL("Out of memory.\n");
+  }
   ASSERT(Utils::IsAligned(result->start(), Zone::kAlignment));
-  if (result != NULL) {
 #ifdef DEBUG
-    // Zap the entire allocated segment (including the header).
-    memset(result, kZapUninitializedByte, size);
+  // Zap the entire allocated segment (including the header).
+  memset(result, kZapUninitializedByte, size);
 #endif
-    result->next_ = next;
-    result->size_ = size;
-  }
+  result->next_ = next;
+  result->size_ = size;
   return result;
 }