Misc typos fixes in ./lib folder

Summary: Found via `codespell -q 3 -I ../clang-whitelist.txt -L uint,importd,crasher,gonna,cant,ue,ons,orign,ned`

Reviewers: teemperor

Reviewed By: teemperor

Subscribers: teemperor, jholewinski, jvesely, nhaehnle, whisperity, jfb, cfe-commits

Differential Revision: https://reviews.llvm.org/D55475

llvm-svn: 348755
diff --git a/clang/lib/AST/ODRHash.cpp b/clang/lib/AST/ODRHash.cpp
index 3aeb7e6..a4c344c 100644
--- a/clang/lib/AST/ODRHash.cpp
+++ b/clang/lib/AST/ODRHash.cpp
@@ -49,7 +49,7 @@
   auto Result = DeclNameMap.insert(std::make_pair(Name, DeclNameMap.size()));
   ID.AddInteger(Result.first->second);
   if (!Result.second) {
-    // If found in map, the the DeclarationName has previously been processed.
+    // If found in map, the DeclarationName has previously been processed.
     return;
   }