Intrinsify writing to Uint8 and Int8 arrays on IA32.

tests/standalone/byte_array_test.dart

Index: tests/standalone/byte_array_test.dart
diff --git a/tests/standalone/byte_array_test.dart b/tests/standalone/byte_array_test.dart
index 2f60f29d18995376bba405495ea19845989a6886..cbf14186a327c8972910073c48e3f15fc2274755 100644
--- a/tests/standalone/byte_array_test.dart
+++ b/tests/standalone/byte_array_test.dart
@@ -20,6 +20,12 @@ void testCreateByteArray() {
   for (int i = 0; i < 10; i++) {
     Expect.equals(0, byteArray[i]);
   }
+  byteArray[1] = 255;
+  Expect.equals(255, byteArray[1]);
+  byteArray[1] = 0;
+  Expect.equals(0, byteArray[1]);
+  // This should eventually throw.
+  byteArray[1] = 256;
 }
 
 void testSetRange() {