Turn CHECK()s into ASSERT()s.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 6f73c1dde433d0c87ac2c73dd9b35cdd03292e7c..5a01d3bc84205a4b38868f142295cb7969e99e92 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -1877,9 +1877,10 @@ 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);
   }
   __ Move(ToRegister(instr->result()), object);
 }