Add more timing information.

runtime/vm/flow_graph_compiler_arm.cc

Index: runtime/vm/flow_graph_compiler_arm.cc
===================================================================
--- runtime/vm/flow_graph_compiler_arm.cc	(revision 6695)
+++ runtime/vm/flow_graph_compiler_arm.cc	(working copy)
@@ -24,6 +24,7 @@
 
 
 void FlowGraphCompiler::CompileGraph() {
+  TimerScope timer(FLAG_compiler_stats, &CompilerStats::graphcompiler_timer);
   Bailout("CompileGraph");
 }
 
@@ -33,6 +34,11 @@
 }
 
 
+void FlowGraphCompiler::FinalizeStackmaps(const Code& code) {
+  UNIMPLEMENTED();
+}
+
+
 void FlowGraphCompiler::FinalizeVarDescriptors(const Code& code) {
   UNIMPLEMENTED();
 }