This is a little experiment to move Failure to a superclass above Object...

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
===================================================================
--- src/ia32/stub-cache-ia32.cc	(revision 5559)
+++ src/ia32/stub-cache-ia32.cc	(working copy)
@@ -811,9 +811,11 @@
                                          GlobalObject* global,
                                          String* name,
                                          Register scratch,
+  Object* probe;
+  { TryAllocation t = global->EnsurePropertyCell(name);
+    if (!t->ToObject(&probe)) return t;
+  }
                                          Label* miss) {
-  Object* probe = global->EnsurePropertyCell(name);
-  if (probe->IsFailure()) return probe;
   JSGlobalPropertyCell* cell = JSGlobalPropertyCell::cast(probe);
   ASSERT(cell->value()->IsTheHole());
   __ mov(scratch, Immediate(Handle<Object>(cell)));
@@ -1314,9 +1316,12 @@
 }
 
 
+  Object* obj;
+  { TryAllocation t =
+        StubCache::ComputeCallMiss(arguments().immediate(), kind_);
+    if (!t->ToObject(&obj)) return t;
+  }
 Object* CallStubCompiler::GenerateMissBranch() {
-  Object* obj = StubCache::ComputeCallMiss(arguments().immediate(), kind_);
-  if (obj->IsFailure()) return obj;
   __ jmp(Handle<Code>(Code::cast(obj)), RelocInfo::CODE_TARGET);
   return obj;
 }
@@ -1368,9 +1373,11 @@
   __ InvokeFunction(edi, arguments(), JUMP_FUNCTION);
 
   // Handle call cache miss.
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   __ bind(&miss);
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return GetCode(FIELD, name);
@@ -1514,9 +1521,11 @@
                                  1);
   }
 
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   __ bind(&miss);
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return GetCode(function);
@@ -1595,9 +1604,11 @@
                                argc + 1,
                                1);
 
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   __ bind(&miss);
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return GetCode(function);
@@ -1665,9 +1676,11 @@
   __ Set(eax, Immediate(Factory::nan_value()));
   __ ret((argc + 1) * kPointerSize);
 
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   __ bind(&miss);
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return GetCode(function);
@@ -1737,9 +1750,11 @@
   __ Set(eax, Immediate(Factory::empty_string()));
   __ ret((argc + 1) * kPointerSize);
 
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   __ bind(&miss);
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return GetCode(function);
@@ -1810,9 +1825,11 @@
   __ InvokeFunction(function, arguments(), JUMP_FUNCTION);
 
   __ bind(&miss);
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   // ecx: function name.
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return (cell == NULL) ? GetCode(function) : GetCode(NORMAL, name);
@@ -1935,9 +1952,11 @@
   __ InvokeFunction(function, arguments(), JUMP_FUNCTION);
 
   __ bind(&miss);
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   // ecx: function name.
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return (cell == NULL) ? GetCode(function) : GetCode(NORMAL, name);
@@ -2038,9 +2057,11 @@
   __ InvokeFunction(function, arguments(), JUMP_FUNCTION);
 
   __ bind(&miss);
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   // ecx: function name.
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return (cell == NULL) ? GetCode(function) : GetCode(NORMAL, name);
@@ -2191,9 +2212,11 @@
   if (depth != kInvalidProtoDepth) {
     FreeSpaceForFastApiCall(masm(), eax);
   }
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   __ bind(&miss_in_smi_check);
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return GetCode(function);
@@ -2256,9 +2279,11 @@
   __ InvokeFunction(edi, arguments(), JUMP_FUNCTION);
 
   // Handle load cache miss.
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   __ bind(&miss);
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return GetCode(INTERCEPTOR, name);
@@ -2317,9 +2342,11 @@
 
   // Handle call cache miss.
   __ bind(&miss);
+  Object* obj;
+  { TryAllocation t = GenerateMissBranch();
+    if (!t->ToObject(&obj)) return t;
+  }
   __ IncrementCounter(&Counters::call_global_inline_miss, 1);
-  Object* obj = GenerateMissBranch();
-  if (obj->IsFailure()) return obj;
 
   // Return the generated code.
   return GetCode(NORMAL, name);