Refactor lithium codegen to not pass around block_ids

src/arm/lithium-codegen-arm.h

Index: src/arm/lithium-codegen-arm.h
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index aeba5eaaa7aa17e7b4661328d9636706247a2fa0..8e56aff72b5bb57d8f85ebac894f62a1c9fdc2ab 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -79,7 +79,6 @@ class LCodeGen BASE_EMBEDDED {
   Heap* heap() const { return isolate()->heap(); }
   Zone* zone() const { return zone_; }
 
-  // TODO(svenpanne) Use this consistently.
   int LookupDestination(int block_id) const {
     return chunk()->LookupDestination(block_id);
   }
@@ -319,7 +318,8 @@ class LCodeGen BASE_EMBEDDED {
 
   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
   void EmitGoto(int block);
-  void EmitBranch(int left_block, int right_block, Condition cc);
+  template<class InstrType>
+  void EmitBranch(InstrType instr, Condition cc);
   void EmitNumberUntagD(Register input,
                         DwVfpRegister result,
                         bool allow_undefined_as_nan,