Use a random seed for the string hash algorithm.

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 10321)
+++ src/heap.cc	(working copy)
@@ -2318,6 +2318,11 @@
   }
   set_infinity_value(HeapNumber::cast(obj));
 
+  // The oddbals have not been created yet, but we want to put something predictable
+  // in the gaps in the symbol table, so lets make that Smi zero.
+  set_undefined(reinterpret_cast<Oddball*>(Smi::FromInt(0)));
+  set_the_hole_value(reinterpret_cast<Oddball*>(Smi::FromInt(0)));
+
   // Allocate initial symbol table.
   { MaybeObject* maybe_obj = SymbolTable::Allocate(kInitialSymbolTableSize);
     if (!maybe_obj->ToObject(&obj)) return false;