Add support for WritableRegister policy in the register allocator.

runtime/vm/flow_graph_compiler_x64.cc

Index: runtime/vm/flow_graph_compiler_x64.cc
diff --git a/runtime/vm/flow_graph_compiler_x64.cc b/runtime/vm/flow_graph_compiler_x64.cc
index fe1c358ebf6cb11cfa548726e6bd1ac3b8a28574..fd7908b81ccd55aca23206aa7711df971413852b 100644
--- a/runtime/vm/flow_graph_compiler_x64.cc
+++ b/runtime/vm/flow_graph_compiler_x64.cc
@@ -913,7 +913,9 @@ void FlowGraphCompiler::GenerateInlinedSetter(intptr_t offset) {
   // Sequence node has one store node and one return NULL node.
   __ movq(RAX, Address(RSP, 2 * kWordSize));  // Receiver.
   __ movq(RBX, Address(RSP, 1 * kWordSize));  // Value.
-  __ StoreIntoObject(RAX, FieldAddress(RAX, offset), RBX);
+  __ StoreIntoObject(RAX,

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

ditto

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

reverted

+                     FieldAddress(RAX, offset),
+                     RBX);
   const Immediate raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
   __ movq(RAX, raw_null);