[GSB] Eliminate unused statistic.

DougGregor · DougGregor · commit c7d0e1631358 · 2018-02-16T14:37:37.000-08:00
diff --git a/lib/AST/GenericSignatureBuilder.cpp b/lib/AST/GenericSignatureBuilder.cpp
@@ -107,8 +107,6 @@ STATISTIC(NumDelayedRequirementUnresolved,
           "Delayed requirements left unresolved");
 STATISTIC(NumConditionalRequirementsAdded,
           "# of conditional requirements added");
-STATISTIC(NumComponentsCollapsedViaRewriting,
-          "# of same-type components collapsed via term rewriting");
 
 namespace  {
 
