Separate branch on strict compare into a new IL instruction.

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
===================================================================
--- runtime/vm/intermediate_language.cc	(revision 11303)
+++ runtime/vm/intermediate_language.cc	(working copy)
@@ -557,7 +557,7 @@
 }
 
 
-void BranchInstr::DiscoverBlocks(
+void ControlInstruction::DiscoverBlocks(
     BlockEntryInstr* current_block,
     GrowableArray<BlockEntryInstr*>* preorder,
     GrowableArray<BlockEntryInstr*>* postorder,
@@ -637,12 +637,12 @@
 }
 
 
-intptr_t BranchInstr::SuccessorCount() const {
+intptr_t ControlInstruction::SuccessorCount() const {
   return 2;
 }
 
 
-BlockEntryInstr* BranchInstr::SuccessorAt(intptr_t index) const {
+BlockEntryInstr* ControlInstruction::SuccessorAt(intptr_t index) const {
   if (index == 0) return true_successor_;
   if (index == 1) return false_successor_;
   UNREACHABLE();
@@ -1226,8 +1226,8 @@
 }
 
 
-void BranchInstr::EmitBranchOnCondition(FlowGraphCompiler* compiler,
-                                        Condition true_condition) {
+void ControlInstruction::EmitBranchOnCondition(FlowGraphCompiler* compiler,
+                                               Condition true_condition) {
   if (compiler->IsNextBlock(false_successor())) {
     // If the next block is the false successor we will fall through to it.
     __ j(true_condition, compiler->GetBlockLabel(true_successor()));