Minor improvements to 458-checker-instruction-simplification.

This follows earlier comments from Roland:
https://android-review.googlesource.com/#/c/140446
  /2/test/458-checker-instruction-simplification/src/Main.java@337
  /2/test/458-checker-instruction-simplification/src/Main.java@465

Change-Id: I255ab74b8885dd8e86bb2c11bba4075fa0eaa183
diff --git a/compiler/optimizing/constant_folding.h b/compiler/optimizing/constant_folding.h
index ac00824..66ff578 100644
--- a/compiler/optimizing/constant_folding.h
+++ b/compiler/optimizing/constant_folding.h
@@ -32,8 +32,8 @@
  */
 class HConstantFolding : public HOptimization {
  public:
-  explicit HConstantFolding(HGraph* graph)
-      : HOptimization(graph, true, kConstantFoldingPassName) {}
+  explicit HConstantFolding(HGraph* graph, const char* name = kConstantFoldingPassName)
+      : HOptimization(graph, true, name) {}
 
   void Run() OVERRIDE;
 
diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index a17d6e1..a95696a 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -317,7 +317,7 @@
 
   HInliner inliner(graph, dex_compilation_unit, dex_compilation_unit, driver, stats);
 
-  HConstantFolding fold2(graph);
+  HConstantFolding fold2(graph, "constant_folding_after_inlining");
   SideEffectsAnalysis side_effects(graph);
   GVNOptimization gvn(graph, side_effects);
   LICM licm(graph, side_effects);