Fixed comment typo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180221 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/ObjCARC/ObjCARCOpts.cpp b/lib/Transforms/ObjCARC/ObjCARCOpts.cpp
index 7a7cdbe..e6c5928 100644
--- a/lib/Transforms/ObjCARC/ObjCARCOpts.cpp
+++ b/lib/Transforms/ObjCARC/ObjCARCOpts.cpp
@@ -3065,7 +3065,7 @@
   // when compiling code that isn't ObjC, skip these if the relevant ObjC
   // library functions aren't declared.
 
-  // Preliminary optimizations. This also computs UsedInThisFunction.
+  // Preliminary optimizations. This also computes UsedInThisFunction.
   OptimizeIndividualCalls(F);
 
   // Optimizations for weak pointers.