Fix typos found by http://github.com/lyda/misspell-check

llvm-svn: 157886
diff --git a/clang/lib/Rewrite/RewriteObjC.cpp b/clang/lib/Rewrite/RewriteObjC.cpp
index 485cffc..396c7ae 100644
--- a/clang/lib/Rewrite/RewriteObjC.cpp
+++ b/clang/lib/Rewrite/RewriteObjC.cpp
@@ -349,7 +349,7 @@
     virtual void RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
                                          std::string &Result) = 0;
     
-    // Misc. AST transformation routines. Somtimes they end up calling
+    // Misc. AST transformation routines. Sometimes they end up calling
     // rewriting routines on the new ASTs.
     CallExpr *SynthesizeCallToFunctionDecl(FunctionDecl *FD,
                                            Expr **args, unsigned nargs,