[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

llvm-svn: 206252
diff --git a/llvm/lib/Support/ManagedStatic.cpp b/llvm/lib/Support/ManagedStatic.cpp
index c05cd22..acd5b1a 100644
--- a/llvm/lib/Support/ManagedStatic.cpp
+++ b/llvm/lib/Support/ManagedStatic.cpp
@@ -45,7 +45,7 @@
 
     llvm_release_global_lock();
   } else {
-    assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
+    assert(!Ptr && !DeleterFn && !Next &&
            "Partially initialized ManagedStatic!?");
     Ptr = Creator ? Creator() : nullptr;
     DeleterFn = Deleter;