Change method name ClearRefCount => ClearKnownPositiveRefCount to match the name of the member that it is modifying.

llvm-svn: 177818
diff --git a/llvm/lib/Transforms/ObjCARC/ObjCARCOpts.cpp b/llvm/lib/Transforms/ObjCARC/ObjCARCOpts.cpp
index 3cfe2aa..88ac8a2 100644
--- a/llvm/lib/Transforms/ObjCARC/ObjCARCOpts.cpp
+++ b/llvm/lib/Transforms/ObjCARC/ObjCARCOpts.cpp
@@ -454,7 +454,7 @@
       KnownPositiveRefCount = true;
     }
 
-    void ClearRefCount() {
+    void ClearKnownPositiveRefCount() {
       KnownPositiveRefCount = false;
     }
 
@@ -1574,7 +1574,7 @@
 
     // Check for possible releases.
     if (CanAlterRefCount(Inst, Ptr, PA, Class)) {
-      S.ClearRefCount();
+      S.ClearKnownPositiveRefCount();
       switch (Seq) {
       case S_Use:
         S.SetSeq(S_CanRelease);
@@ -1732,7 +1732,7 @@
     Arg = GetObjCArg(Inst);
 
     PtrState &S = MyStates.getPtrTopDownState(Arg);
-    S.ClearRefCount();
+    S.ClearKnownPositiveRefCount();
 
     switch (S.GetSeq()) {
     case S_Retain:
@@ -1778,7 +1778,7 @@
 
     // Check for possible releases.
     if (CanAlterRefCount(Inst, Ptr, PA, Class)) {
-      S.ClearRefCount();
+      S.ClearKnownPositiveRefCount();
       switch (Seq) {
       case S_Retain:
         S.SetSeq(S_CanRelease);