Replace NULL with nullptr

Also fixed some lines that were too long, and a few other minor
details.

Change-Id: I6efba5fb6e03eb5d0a300fddb2a75bf8e2f175cb
diff --git a/compiler/dex/verified_method.cc b/compiler/dex/verified_method.cc
index 977757f..7eba515 100644
--- a/compiler/dex/verified_method.cc
+++ b/compiler/dex/verified_method.cc
@@ -166,7 +166,7 @@
         }
       }
     } else {
-      DCHECK(i >= 65536 || reg_bitmap == NULL);
+      DCHECK(i >= 65536 || reg_bitmap == nullptr);
     }
   }
 }
@@ -283,7 +283,7 @@
     }
     mirror::ArtMethod* abstract_method = method_verifier->GetDexCache()->GetResolvedMethod(
         is_range ? inst->VRegB_3rc() : inst->VRegB_35c());
-    if (abstract_method == NULL) {
+    if (abstract_method == nullptr) {
       // If the method is not found in the cache this means that it was never found
       // by ResolveMethodAndCheckAccess() called when verifying invoke_*.
       continue;