Add support for tracking down leak of the hole value.

src/ia32/codegen-ia32.cc

Index: src/ia32/codegen-ia32.cc
===================================================================
--- src/ia32/codegen-ia32.cc	(revision 2430)
+++ src/ia32/codegen-ia32.cc	(working copy)
@@ -7591,6 +7591,16 @@
     __ dec(Operand::StaticVariable(scope_depth));
   }
 
+  // Make sure we're not trying to return 'the hole' from the runtime
+  // call as this may lead to crashes in the IC code later.
+  if (FLAG_debug_code) {
+    Label okay;
+    __ cmp(Operand(eax), Immediate(Factory::the_hole_value()));

[Kevin Millikin (Chromium), 2009/07/13 09:10:07]

There is a cmp(Register, Handle<Object>) assembler instruction on IA32.  Same
encoding, but reads better at the call site.

+    __ j(not_equal, &okay);
+    __ int3();
+    __ bind(&okay);
+  }
+
   // Check for failure result.
   Label failure_returned;
   ASSERT(((kFailureTag + 1) & kFailureTagMask) == 0);