Fix typo in comment.

llvm-svn: 36873
diff --git a/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
index 5a6b466..9a7bcc7 100644
--- a/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
+++ b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
@@ -63,7 +63,7 @@
     }
 
     virtual bool runOnSCC(const std::vector<CallGraphNode *> &SCC);
-    static char ID; // Pass identifcation, replacement for typeid
+    static char ID; // Pass identification, replacement for typeid
     ArgPromotion() : CallGraphSCCPass((intptr_t)&ID) {}
 
   private: