Simplify TryInline's signature.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 7d0e228e8eeae3e88bc930be8d518966713afa99..a8f4fbef0bbebd51c588051864bb8ccd657bc7bf 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -6550,7 +6550,7 @@ int HGraphBuilder::InliningAstSize(Handle<JSFunction> target) {
 
 bool HGraphBuilder::TryInline(CallKind call_kind,
                               Handle<JSFunction> target,
-                              ZoneList<Expression*>* arguments,
+                              int arguments_count,
                               HValue* receiver,
                               int ast_id,
                               int return_id,
@@ -6712,7 +6712,7 @@ bool HGraphBuilder::TryInline(CallKind call_kind,
   HConstant* undefined = graph()->GetConstantUndefined();
   HEnvironment* inner_env =
       environment()->CopyForInlining(target,
-                                     arguments->length(),
+                                     arguments_count,
                                      function,
                                      undefined,
                                      call_kind,
@@ -6748,7 +6748,7 @@ bool HGraphBuilder::TryInline(CallKind call_kind,
 
   HEnterInlined* enter_inlined =
       new(zone()) HEnterInlined(target,
-                                arguments->length(),
+                                arguments_count,
                                 function,
                                 call_kind,
                                 function_state()->is_construct(),
@@ -6851,7 +6851,7 @@ bool HGraphBuilder::TryInlineCall(Call* expr, bool drop_extra) {
 
   return TryInline(call_kind,
                    expr->target(),
-                   expr->arguments(),
+                   expr->arguments()->length(),
                    NULL,
                    expr->id(),
                    expr->ReturnId(),
@@ -6862,7 +6862,7 @@ bool HGraphBuilder::TryInlineCall(Call* expr, bool drop_extra) {
 bool HGraphBuilder::TryInlineConstruct(CallNew* expr, HValue* receiver) {
   return TryInline(CALL_AS_FUNCTION,
                    expr->target(),
-                   expr->arguments(),
+                   expr->arguments()->length(),
                    receiver,
                    expr->id(),
                    expr->ReturnId(),