Revert previous commit.  It seems that whether casting to void
is valid or not depends on which system you build.

llvm-svn: 134321
diff --git a/llvm/lib/Support/Valgrind.cpp b/llvm/lib/Support/Valgrind.cpp
index 2e57eb7..7034485 100644
--- a/llvm/lib/Support/Valgrind.cpp
+++ b/llvm/lib/Support/Valgrind.cpp
@@ -39,7 +39,7 @@
   if (NotUnderValgrind)
     return;
 
-  (void)VALGRIND_DISCARD_TRANSLATIONS(Addr, Len);
+  VALGRIND_DISCARD_TRANSLATIONS(Addr, Len);
 }
 
 #else  // !HAVE_VALGRIND_VALGRIND_H