Add valgrind suppression file

valgrind.supp

@@ -0,0 +1,10 @@
+{
+  LLVM
+  Memcheck:Leak
+  match-leak-kinds: reachable
+  fun:malloc
+  fun:strdup
+  fun:parseAndSetFilename
+  fun:__llvm_profile_initialize
+  ...
+}