[llvm-mca] run clang-format on all files.

This also addresses Simon's review comment in D44839.

llvm-svn: 328428
diff --git a/llvm/tools/llvm-mca/View.h b/llvm/tools/llvm-mca/View.h
index e5d22866..9ba94a5 100644
--- a/llvm/tools/llvm-mca/View.h
+++ b/llvm/tools/llvm-mca/View.h
@@ -27,7 +27,6 @@
   virtual ~View() = default;
   void anchor() override;
 };
-
-}
+} // namespace mca
 
 #endif