Fix typo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97818 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 350ef5a..8384ab7 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2259,7 +2259,7 @@
   } else if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(Arg)) {
     if (Flags.isByVal())
       // ByVal argument is passed in as a pointer but it's now being
-      // derefernced. e.g.
+      // dereferenced. e.g.
       // define @foo(%struct.X* %A) {
       //   tail call @bar(%struct.X* byval %A)
       // }