build fix

TBR=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/652163002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24590 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler/instruction.cc

@@ -322,7 +322,7 @@ InstructionSequence::InstructionSequence(Linkage* linkage, Graph* graph,
     : zone_(schedule->zone()),
       node_count_(graph->NodeCount()),
       node_map_(zone()->NewArray<int>(node_count_)),
-      block_data_(schedule->BasicBlockCount(), zone()),
+      block_data_(static_cast<int>(schedule->BasicBlockCount()), zone()),
       linkage_(linkage),
       schedule_(schedule),
       constants_(ConstantMap::key_compare(),