Fix copyright lines for Bits.h and move BitsBenchmark.cpp

Summary: [Folly] Fix copyright lines for `Bits.h` and move `BitsBenchmark.cpp`.

Reviewed By: spalamarchuk

Differential Revision: D6648828

fbshipit-source-id: 5eed558ac2d47a1497d64173bc84a4ca27d79764

folly/lang/Bits.h

 /*
- * Copyright 2017 Facebook, Inc.
+ * Copyright 2011-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

folly/test/BitsBenchmark.cpp → folly/lang/test/BitsBenchmark.cpp

 /*
- * Copyright 2017 Facebook, Inc.
+ * Copyright 2016-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

folly/lang/test/BitsTest.cpp

 /*
- * Copyright 2017 Facebook, Inc.
+ * Copyright 2011-present Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

folly/test/Makefile.am

@@ -162,7 +162,7 @@ math_test_SOURCES = MathTest.cpp
 math_test_LDADD = libfollytestmain.la $(top_builddir)/libfollybenchmark.la
 TESTS += math_test
 
-bits_test_SOURCES = BitsTest.cpp
+bits_test_SOURCES = ../lang/test/BitsTest.cpp
 bits_test_LDADD = libfollytestmain.la $(top_builddir)/libfollybenchmark.la
 TESTS += bits_test