VM: Move representation selection code out of the flow graph optimizer.

runtime/vm/flow_graph_compiler_mips.cc

Index: runtime/vm/flow_graph_compiler_mips.cc
diff --git a/runtime/vm/flow_graph_compiler_mips.cc b/runtime/vm/flow_graph_compiler_mips.cc
index f9777c06cb2639dab7f475c951fe3f8024819448..273a0e0e08f73a4112c1c5610da6149249d30c7c 100644
--- a/runtime/vm/flow_graph_compiler_mips.cc
+++ b/runtime/vm/flow_graph_compiler_mips.cc
@@ -73,6 +73,13 @@ bool FlowGraphCompiler::SupportsHardwareDivision() {
 }
 
 
+bool FlowGraphCompiler::CanConvertUnboxedMintToDouble() {
+  // TODO(johnmccutchan): Investigate possibility on MIPS once
+  // mints are implemented there.
+  return false;
+}
+
+
 void FlowGraphCompiler::EnterIntrinsicMode() {
   ASSERT(!intrinsic_mode());
   intrinsic_mode_ = true;