Add checks to runtime functions.

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index de8e490d2873c87cc4c43c46b7326eafcb0411fb..7fb7cc3215239810232cf8e9cf2e3eb24c474311 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -3068,19 +3068,18 @@ void FullCodeGenerator::EmitDateField(CallRuntime* expr) {
 
   VisitForAccumulatorValue(args->at(0));  // Load the object.
 
-  Label runtime, done;
+  Label runtime, done, not_date_object;
   Register object = eax;
   Register result = eax;
   Register scratch = ecx;
 
-#ifdef DEBUG
-  __ AbortIfSmi(object);
+  __ JumpIfSmi(object, &not_date_object);
   __ CmpObjectType(object, JS_DATE_TYPE, scratch);
-  __ Assert(equal, "Trying to get date field from non-date.");
-#endif
+  __ j(not_equal, &not_date_object);
 
   if (index->value() == 0) {
     __ mov(result, FieldOperand(object, JSDate::kValueOffset));
+    __ jmp(&done);
   } else {
     if (index->value() < JSDate::kFirstUncachedField) {
       ExternalReference stamp = ExternalReference::date_cache_stamp(isolate());
@@ -3096,8 +3095,12 @@ void FullCodeGenerator::EmitDateField(CallRuntime* expr) {
     __ mov(Operand(esp, 0), object);
     __ mov(Operand(esp, 1 * kPointerSize), Immediate(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(result);
 }
 
@@ -3522,9 +3525,7 @@ void FullCodeGenerator::EmitGetCachedArrayIndex(CallRuntime* expr) {
   ASSERT(args->length() == 1);
   VisitForAccumulatorValue(args->at(0));
 
-  if (generate_debug_code_) {
-    __ AbortIfNotString(eax);
-  }
+  __ AbortIfNotString(eax);
 
   __ mov(eax, FieldOperand(eax, String::kHashFieldOffset));
   __ IndexFromHash(eax, eax);