Debugger: use debug break slot to break on call.

src/full-codegen.h

Index: src/full-codegen.h
diff --git a/src/full-codegen.h b/src/full-codegen.h
index a2d23f069dafe1b8f1a3834a1d22cac71e307369..32761e1bd28db40262ab96450f9350be9d8e0f97 100644
--- a/src/full-codegen.h
+++ b/src/full-codegen.h
@@ -675,6 +675,8 @@ class FullCodeGenerator: public AstVisitor {
   // This is used in loop headers where we want to break for each iteration.
   void SetExpressionAsStatementPosition(Expression* expr);
 
+  void SetCallPosition(Expression* expr, int argc);
+
   // Non-local control flow support.
   void EnterTryBlock(int handler_index, Label* handler);
   void ExitTryBlock(int handler_index);