Add support for WritableRegister policy in the register allocator.

runtime/vm/flow_graph_compiler_ia32.cc

Index: runtime/vm/flow_graph_compiler_ia32.cc
diff --git a/runtime/vm/flow_graph_compiler_ia32.cc b/runtime/vm/flow_graph_compiler_ia32.cc
index 8d75c74b3131af9c2f499d5b9c53b72e22842a89..117b81bb7593390801a968c481e20284ddb72b0b 100644
--- a/runtime/vm/flow_graph_compiler_ia32.cc
+++ b/runtime/vm/flow_graph_compiler_ia32.cc
@@ -906,7 +906,9 @@ void FlowGraphCompiler::GenerateInlinedSetter(intptr_t offset) {
   // Sequence node has one store node and one return NULL node.
   __ movl(EAX, Address(ESP, 2 * kWordSize));  // Receiver.
   __ movl(EBX, Address(ESP, 1 * kWordSize));  // Value.
-  __ StoreIntoObject(EAX, FieldAddress(EAX, offset), EBX);
+  __ StoreIntoObject(EAX,

[Ivan Posva, 2012/09/11 11:57:30]

Why this change?

[Vyacheslav Egorov (Google), 2012/09/11 12:18:05]

Initially I was also passing additional argument, but then I reverted that. 

Reverting reformatting.

+                     FieldAddress(EAX, offset),
+                     EBX);
   const Immediate raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
   __ movl(EAX, raw_null);