Intrinsify writing to Uint8 and Int8 arrays on IA32.

runtime/vm/intrinsifier_x64.cc

Index: runtime/vm/intrinsifier_x64.cc
diff --git a/runtime/vm/intrinsifier_x64.cc b/runtime/vm/intrinsifier_x64.cc
index 781cf4a117175cc58dac3922e0a487597d706d59..4d2ae1bf29f3d94dc78e505ffe0cc3c4753868ff 100644
--- a/runtime/vm/intrinsifier_x64.cc
+++ b/runtime/vm/intrinsifier_x64.cc
@@ -461,6 +461,20 @@ bool Intrinsifier::Int8Array_getIndexed(Assembler* assembler) {
 }
 
 
+bool Intrinsifier::Int8Array_setIndexed(Assembler* assembler) {
+  Label fall_through;
+  __ Bind(&fall_through);
+  return false;
+}
+
+
+bool Intrinsifier::Uint8Array_setIndexed(Assembler* assembler) {
+  Label fall_through;
+  __ Bind(&fall_through);
+  return false;
+}
+
+
 bool Intrinsifier::Uint8Array_getIndexed(Assembler* assembler) {
   Label fall_through;
   TestByteArrayIndex(assembler, &fall_through);