Refactor lithium codegen to not pass around block_ids

src/x64/lithium-codegen-x64.h

Index: src/x64/lithium-codegen-x64.h
diff --git a/src/x64/lithium-codegen-x64.h b/src/x64/lithium-codegen-x64.h
index b0114d0d377758c686091f2f11bbb588b3324b81..116f8759b6f9b0405d079b0f6590f07ba2557436 100644
--- a/src/x64/lithium-codegen-x64.h
+++ b/src/x64/lithium-codegen-x64.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);
   }
@@ -283,7 +282,8 @@ 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,
       XMMRegister result,