VM: Fix identical comparisons with bigints.

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
===================================================================
--- runtime/vm/intermediate_language_mips.cc	(revision 30047)
+++ runtime/vm/intermediate_language_mips.cc	(working copy)
@@ -3811,6 +3811,14 @@
 LocationSummary* StrictCompareInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
+  if (needs_number_check()) {
+    LocationSummary* locs =
+        new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
+    locs->set_in(0, Location::RegisterLocation(A0));
+    locs->set_in(1, Location::RegisterLocation(A1));
+    locs->set_out(Location::RegisterLocation(A0));
+    return locs;
+  }
   LocationSummary* locs =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   locs->set_in(0, Location::RegisterOrConstant(left()));