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/CodeGen/CGDebugInfo.h b/clang/lib/CodeGen/CGDebugInfo.h
index 4b627d6..adb8977 100644
--- a/clang/lib/CodeGen/CGDebugInfo.h
+++ b/clang/lib/CodeGen/CGDebugInfo.h
@@ -740,7 +740,7 @@
   /// function \p InlinedFn. The current debug location becomes the inlined call
   /// site of the inlined function.
   ApplyInlineDebugLocation(CodeGenFunction &CGF, GlobalDecl InlinedFn);
-  /// Restore everything back to the orginial state.
+  /// Restore everything back to the original state.
   ~ApplyInlineDebugLocation();
 };