Fix comment typo



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40898 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/LowerGC.cpp b/lib/Transforms/Scalar/LowerGC.cpp
index d945609..8e6611a 100644
--- a/lib/Transforms/Scalar/LowerGC.cpp
+++ b/lib/Transforms/Scalar/LowerGC.cpp
@@ -201,7 +201,7 @@
                 
                 // It sure would be nice to pass op_begin()+1,
                 // op_begin()+2 but it runs into trouble with
-                // CallInst::init's &*ierator, which requires a
+                // CallInst::init's &*iterator, which requires a
                 // conversion from Use* to Value*.  The conversion
                 // from Use to Value * is not useful because the
                 // memory for Value * won't be contiguous.