[patch] libcxx test suite bit testing test cases for clz/ctz

[G M]

Hi Everyone

Here's a few test cases I wrote to test the fixes for the clz and ctz
functions I wrote for MSVC previously that have been already committed.

They contain some suggested changes from Marshall and I have tested they
compile with clang++/g++ and cl.exe against libcxx.
If the tests fail, they call assert and give some details about the failure
point/reason. If they pass, they produce no output.

The test cases basically just set some bit values in various types and
check the leading and trailing zero count is as expected.

For the test  cases to compile with cl.exe, the type_traits patch for
libcxx and MSVC that I previously submitted needs to be applied.

Thanks.
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