Turn CHECK()s into ASSERT()s.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index ee37d0b5837404cc9db6bfd420a69f615221da67..2872d4dc0d676308c2b40641b75d28bf906201bd 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -2015,9 +2015,10 @@ void LCodeGen::DoConstantT(LConstantT* instr) {
   AllowDeferredHandleDereference smi_check;
   if (instr->hydrogen()->HasObjectMap()) {
     Handle<Map> object_map = instr->hydrogen()->ObjectMap().handle();
-    CHECK(object->IsHeapObject());
-    CHECK(!object_map->is_stable() ||
-          *object_map == Handle<HeapObject>::cast(object)->map());
+    ASSERT(object->IsHeapObject());
+    ASSERT(!object_map->is_stable() ||
+           *object_map == Handle<HeapObject>::cast(object)->map());
+    USE(object_map);
   }
   __ LoadObject(reg, object);
 }