run mir opt test with mir-opt-level=3 so they fire

diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index f2acfa517ced5b3e36aa75afa5537ac5cfbcbf1f..6647a1a0a933d41046dc22ad79e0709a52393967 100644 (file)
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -1340,6 +1340,8 @@ fn make_compile_args(&self,
             MirOpt => {
                 args.extend(["-Z",
                              "dump-mir=all",
+                             "-Z",
+                             "mir-opt-level=3",
                              "-Z"]
                             .iter()
                             .map(|s| s.to_string()));