Improve Hydrogen code for accessing undefined/null/Infinity.

src/heap.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2174 matching lines @@
     if (!maybe_obj->ToObject(&obj)) return false;
   }
   set_minus_zero_value(obj);
   ASSERT(signbit(minus_zero_value()->Number()) != 0);
 
   { MaybeObject* maybe_obj = AllocateHeapNumber(OS::nan_value(), TENURED);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
   set_nan_value(obj);
 
+  { MaybeObject* maybe_obj = AllocateHeapNumber(V8_INFINITY, TENURED);
+    if (!maybe_obj->ToObject(&obj)) return false;
+  }
+  set_infinity_value(obj);
+
   { MaybeObject* maybe_obj = Allocate(oddball_map(), OLD_POINTER_SPACE);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
   set_undefined_value(obj);
   Oddball::cast(obj)->set_kind(Oddball::kUndefined);
   ASSERT(!InNewSpace(undefined_value()));
 
   // Allocate initial symbol table.
   { MaybeObject* maybe_obj = SymbolTable::Allocate(kInitialSymbolTableSize);
     if (!maybe_obj->ToObject(&obj)) return false;
@@ skipping 4183 matching lines @@
   }
   isolate_->heap()->store_buffer()->Filter(MemoryChunk::ABOUT_TO_BE_FREED);
   for (chunk = chunks_queued_for_free_; chunk != NULL; chunk = next) {
     next = chunk->next_chunk();
     isolate_->memory_allocator()->Free(chunk);
   }
   chunks_queued_for_free_ = NULL;
 }
 
 } }  // namespace v8::internal