Detect leaf optimized methods and skip stack check overflow test in those, unless it is in a loop (…

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
===================================================================
--- runtime/vm/intermediate_language_mips.cc	(revision 21683)
+++ runtime/vm/intermediate_language_mips.cc	(working copy)
@@ -65,7 +65,7 @@
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs =
-      new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
+      new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::RegisterLocation(V0));
   return locs;
 }