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/CGOpenMPRuntime.h b/clang/lib/CodeGen/CGOpenMPRuntime.h
index f4a8a97..d9ac5df 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.h
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.h
@@ -1557,7 +1557,7 @@
   virtual Address getAddressOfLocalVariable(CodeGenFunction &CGF,
                                             const VarDecl *VD);
 
-  /// Marks the declaration as alread emitted for the device code and returns
+  /// Marks the declaration as already emitted for the device code and returns
   /// true, if it was marked already, and false, otherwise.
   bool markAsGlobalTarget(GlobalDecl GD);