Use -output-prefix in bugpoint tests so that outputs go in temp directory (and
we don't race on them).

llvm-svn: 81155
diff --git a/llvm/test/BugPoint/remove_arguments_test.ll b/llvm/test/BugPoint/remove_arguments_test.ll
index e565597..fb17c78 100644
--- a/llvm/test/BugPoint/remove_arguments_test.ll
+++ b/llvm/test/BugPoint/remove_arguments_test.ll
@@ -1,4 +1,4 @@
-; RUN: bugpoint %s -bugpoint-crashcalls -silence-passes
+; RUN: bugpoint %s -output-prefix %t -bugpoint-crashcalls -silence-passes
 
 ; Test to make sure that arguments are removed from the function if they are 
 ; unnecessary.