Add StackProf to the test group for 2.1

Makes life easier for people profiling on master.

1 files changed, 4 insertions, 0 deletions

diff --git a/Gemfile b/Gemfile
index fa17d217c9..e7b7913970 100644
--- a/Gemfile
+++ b/Gemfile
@@ -64,6 +64,10 @@ group :test do
     gem 'ruby-prof', '~> 0.11.2'
   end
 
+  platforms :mri_21 do
+    gem 'stackprof'
+  end
+
   # platforms :mri_19, :mri_20 do
   #   gem 'debugger'
   # end