Separate branch on strict compare into a new IL instruction.

runtime/vm/flow_graph_builder.cc

Index: runtime/vm/flow_graph_builder.cc
===================================================================
--- runtime/vm/flow_graph_builder.cc	(revision 11303)
+++ runtime/vm/flow_graph_builder.cc	(working copy)
@@ -276,11 +276,8 @@
   }
   const Bool& bool_true = Bool::ZoneHandle(Bool::True());
   Value* constant_true = Bind(Constant(bool_true));
-  BranchInstr* branch = new BranchInstr(condition_token_pos(),
-                                        owner()->try_index(),
-                                        value,
-                                        constant_true,
-                                        Token::kEQ_STRICT);
+  StrictCompareAndBranchInstr* branch =
+      new StrictCompareAndBranchInstr(value, constant_true, Token::kEQ_STRICT);
   AddInstruction(branch);
   CloseFragment();
   true_successor_address_ = branch->true_successor_address();
@@ -306,11 +303,10 @@
   ASSERT(!FLAG_enable_type_checks);
   const Bool& bool_true = Bool::ZoneHandle(Bool::True());
   Value* constant_true = Bind(Constant(bool_true));
-  BranchInstr* branch = new BranchInstr(condition_token_pos(),
-                                        owner()->try_index(),
-                                        comp->value(),
-                                        constant_true,
-                                        Token::kNE_STRICT);
+  StrictCompareAndBranchInstr* branch =
+      new StrictCompareAndBranchInstr(comp->value(),
+                                      constant_true,
+                                      Token::kNE_STRICT);
   AddInstruction(branch);
   CloseFragment();
   true_successor_address_ = branch->true_successor_address();