optimizing: Add statistics for # of constructor fences added/removed

Statistics are attributed as follows:

Added because:
* HNewInstances requires a HConstructorFence following it.
* HReturn requires a HConstructorFence (for final fields) preceding it.

Removed because:
* Optimized in Load-Store-Elimination.
* Optimized in Prepare-For-Register-Allocation.

Test: art/test.py
Bug: 36656456
Change-Id: Ic119441c5151a5a840fc6532b411340e2d68e5eb

1 files changed, 9 insertions, 0 deletions

diff --git a/compiler/optimizing/optimizing_compiler_stats.h b/compiler/optimizing/optimizing_compiler_stats.h
index 098d23dac1..d6da73cc1c 100644
--- a/compiler/optimizing/optimizing_compiler_stats.h
+++ b/compiler/optimizing/optimizing_compiler_stats.h
@@ -23,6 +23,7 @@
 #include <type_traits>
 
 #include "atomic.h"
+#include "globals.h"
 
 namespace art {
 
@@ -86,6 +87,10 @@ enum MethodCompilationStat {
   kNotInlinedWont,
   kNotInlinedRecursiveBudget,
   kNotInlinedProxy,
+  kConstructorFenceGeneratedNew,
+  kConstructorFenceGeneratedFinal,
+  kConstructorFenceRemovedLSE,
+  kConstructorFenceRemovedPFRA,
   kLastStat
 };
 
@@ -202,6 +207,10 @@ class OptimizingCompilerStats {
       case kNotInlinedWont: name = "NotInlinedWont"; break;
       case kNotInlinedRecursiveBudget: name = "NotInlinedRecursiveBudget"; break;
       case kNotInlinedProxy: name = "NotInlinedProxy"; break;
+      case kConstructorFenceGeneratedNew: name = "ConstructorFenceGeneratedNew"; break;
+      case kConstructorFenceGeneratedFinal: name = "ConstructorFenceGeneratedFinal"; break;
+      case kConstructorFenceRemovedLSE: name = "ConstructorFenceRemovedLSE"; break;
+      case kConstructorFenceRemovedPFRA: name = "ConstructorFenceRemovedPFRA"; break;
 
       case kLastStat:
         LOG(FATAL) << "invalid stat "