Add checks to runtime functions.

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 85e94f29649dacf999f1fbf7afd4415a6f48bfb0..b2f629b26c4cbca143eb491ed1c746d7eb4ea798 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -3134,20 +3134,19 @@ void FullCodeGenerator::EmitDateField(CallRuntime* expr) {
 
   VisitForAccumulatorValue(args->at(0));  // Load the object.
 
-  Label runtime, done;
+  Label runtime, done, not_date_object;
   Register object = r0;
   Register result = r0;
   Register scratch0 = r9;
   Register scratch1 = r1;
 
-#ifdef DEBUG
-  __ AbortIfSmi(object);
+  __ JumpIfSmi(object, &not_date_object);
   __ CompareObjectType(object, scratch1, scratch1, JS_DATE_TYPE);
-  __ Assert(eq, "Trying to get date field from non-date.");
-#endif
+  __ b(ne, &not_date_object);
 
   if (index->value() == 0) {
     __ ldr(result, FieldMemOperand(object, JSDate::kValueOffset));
+    __ jmp(&done);
   } else {
     if (index->value() < JSDate::kFirstUncachedField) {
       ExternalReference stamp = ExternalReference::date_cache_stamp(isolate());
@@ -3164,8 +3163,12 @@ void FullCodeGenerator::EmitDateField(CallRuntime* expr) {
     __ PrepareCallCFunction(2, scratch1);
     __ mov(r1, Operand(index));
     __ CallCFunction(ExternalReference::get_date_field_function(isolate()), 2);
-    __ bind(&done);
+    __ jmp(&done);
   }
+
+  __ bind(&not_date_object);
+  __ CallRuntime(Runtime::kThrowNotDateError, 0);
+  __ bind(&done);
   context()->Plug(r0);
 }
 
@@ -3580,9 +3583,8 @@ void FullCodeGenerator::EmitGetCachedArrayIndex(CallRuntime* expr) {
   ASSERT(args->length() == 1);
   VisitForAccumulatorValue(args->at(0));
 
-  if (generate_debug_code_) {
-    __ AbortIfNotString(r0);
-  }
+  __ AbortIfNotString(r0);
+
 
   __ ldr(r0, FieldMemOperand(r0, String::kHashFieldOffset));
   __ IndexFromHash(r0, r0);