[ThinLTO/CFI] Minor comment clarification

[tejohnson]

Summary

Suggested by Duncan on the review thread for D46699.

[pcc]

LGTM

llvm/trunk/include/llvm/IR/ModuleSummaryIndex.h

private:
 
   /// List of <CalleeValueInfo, CalleeInfo> call edge pairs from this function.
   std::vector<EdgeTy> CallGraphEdgeList;
 
   /// All type identifier related information. Because these fields are
   /// relatively uncommon we only allocate space for them if necessary.
   struct TypeIdInfo {
     /// List of type identifiers used by this function in llvm.type.test
-    /// intrinsics other than by an llvm.assume intrinsic, represented as GUIDs.
+    /// intrinsics referenced by something other than an llvm.assume intrinsic,
+    /// represented as GUIDs.
     std::vector<GlobalValue::GUID> TypeTests;
 
     /// List of virtual calls made by this function using (respectively)
     /// llvm.assume(llvm.type.test) or llvm.type.checked.load intrinsics that do
     /// not have all constant integer arguments.
     std::vector<VFuncId> TypeTestAssumeVCalls, TypeCheckedLoadVCalls;
 
     /// List of virtual calls made by this function using (respectively)