[PATCH] [libcxx] Fix ctype_byname<wchar_t>::do_is() mask checking.

[Dan Albert]

Hi mclow.lists, EricWF,

The previous method was very dependent on how the ctype masks were defined. For example, Android has print defined as `(punct | upper | lower | digit | blank)`. When calling `do_is(upper, L'a')`, result would be set to true by `if (upper & print) result |= iswprint_l(L'a', __l)`;

http://reviews.llvm.org/D5071

Files:
  src/locale.cpp
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