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/oat_writer.h b/compiler/oat_writer.h
index cc2b39a..8c79b44 100644
--- a/compiler/oat_writer.h
+++ b/compiler/oat_writer.h
@@ -235,13 +235,13 @@
     // used to validate file position when writing.
     size_t offset_;
 
-    // CompiledMethods for each class_def_method_index, or NULL if no method is available.
+    // CompiledMethods for each class_def_method_index, or null if no method is available.
     std::vector<CompiledMethod*> compiled_methods_;
 
     // Offset from OatClass::offset_ to the OatMethodOffsets for the
     // class_def_method_index. If 0, it means the corresponding
     // CompiledMethod entry in OatClass::compiled_methods_ should be
-    // NULL and that the OatClass::type_ should be kOatClassBitmap.
+    // null and that the OatClass::type_ should be kOatClassBitmap.
     std::vector<uint32_t> oat_method_offsets_offsets_from_oat_class_;
 
     // data to write
@@ -258,12 +258,12 @@
     // OatClassType::type_ is kOatClassBitmap, a set bit indicates the
     // method has an OatMethodOffsets in methods_offsets_, otherwise
     // the entry was ommited to save space. If OatClassType::type_ is
-    // not is kOatClassBitmap, the bitmap will be NULL.
+    // not is kOatClassBitmap, the bitmap will be null.
     BitVector* method_bitmap_;
 
     // OatMethodOffsets and OatMethodHeaders for each CompiledMethod
     // present in the OatClass. Note that some may be missing if
-    // OatClass::compiled_methods_ contains NULL values (and
+    // OatClass::compiled_methods_ contains null values (and
     // oat_method_offsets_offsets_from_oat_class_ should contain 0
     // values in this case).
     std::vector<OatMethodOffsets> method_offsets_;