Fix typo in comment.

llvm-svn: 36873
diff --git a/llvm/lib/Transforms/Utils/Mem2Reg.cpp b/llvm/lib/Transforms/Utils/Mem2Reg.cpp
index 7ffafd8..0fddda3 100644
--- a/llvm/lib/Transforms/Utils/Mem2Reg.cpp
+++ b/llvm/lib/Transforms/Utils/Mem2Reg.cpp
@@ -27,7 +27,7 @@
 
 namespace {
   struct VISIBILITY_HIDDEN PromotePass : public FunctionPass {
-    static char ID; // Pass identifcation, replacement for typeid
+    static char ID; // Pass identification, replacement for typeid
     PromotePass() : FunctionPass((intptr_t)&ID) {}
 
     // runOnFunction - To run this pass, first we calculate the alloca