cpplint: Cleanup errors

Cleanup errors from upstream cpplint in preparation
for moving art's cpplint fork to upstream tip-of-tree cpplint.

Test: cd art && mm
Bug: 68951293
Change-Id: I15faed4594cbcb8399850f8bdee39d42c0c5b956
diff --git a/compiler/optimizing/side_effects_analysis.h b/compiler/optimizing/side_effects_analysis.h
index cf00e48..c0f81a9 100644
--- a/compiler/optimizing/side_effects_analysis.h
+++ b/compiler/optimizing/side_effects_analysis.h
@@ -25,7 +25,7 @@
 
 class SideEffectsAnalysis : public HOptimization {
  public:
-  SideEffectsAnalysis(HGraph* graph, const char* pass_name = kSideEffectsAnalysisPassName)
+  explicit SideEffectsAnalysis(HGraph* graph, const char* pass_name = kSideEffectsAnalysisPassName)
       : HOptimization(graph, pass_name),
         graph_(graph),
         block_effects_(graph->GetBlocks().size(),