Correct hyphenations in comments and assert messages

This patch tries to avoid unrelated changes other than fixing a few
hyphen-related ambiguities in nearby lines.

llvm-svn: 196466
diff --git a/clang/lib/Analysis/ThreadSafety.cpp b/clang/lib/Analysis/ThreadSafety.cpp
index 6e0e173..8e02dba 100644
--- a/clang/lib/Analysis/ThreadSafety.cpp
+++ b/clang/lib/Analysis/ThreadSafety.cpp
@@ -2043,7 +2043,7 @@
         break;
       }
 
-      // Ignore other (non thread-safety) attributes
+      // Ignore attributes unrelated to thread-safety
       default:
         break;
     }