Fix comment typos.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54266 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/ConstantProp.cpp b/lib/Transforms/Scalar/ConstantProp.cpp
index dbbc861..05bb4f0 100644
--- a/lib/Transforms/Scalar/ConstantProp.cpp
+++ b/lib/Transforms/Scalar/ConstantProp.cpp
@@ -14,7 +14,7 @@
 //
 // Notice that:
 //   * This pass has a habit of making definitions be dead.  It is a good idea
-//     to to run a DIE pass sometime after running this pass.
+//     to run a DIE pass sometime after running this pass.
 //
 //===----------------------------------------------------------------------===//