update the miri submodule

japaric · japaric · commit 4bfefd94fdff · 2018-06-03T14:27:46.000+02:00
diff --git a/src/tools/miri b/src/tools/miri
@@ -1 +1 @@
-Subproject commit 066a284557ff6e6a2aa19084f599f167a724af7b
+Subproject commit 8284b4e912baf72473c3696ce9e46cc334da18e4
