[PATCH] Handle function name conflicts in _LIBCPP_MSVCRT mode

[Saleem Abdulrasool]

Hi mclow.lists,

Visual Studio's SAL extension uses a macro for __deallocate.  This macro is used
pervasively, and gets included through various different ways.  This conflicts
with the similarly named interfaces in libc++.  Introduce a __undef header
similar to __undef_min_max to handle this.  This fixes a number of errors due to
the macro replacing the function name.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7420

Files:
  include/__hash_table
  include/__sso_allocator
  include/__undef___deallocate
  include/experimental/dynarray
  include/memory
  include/module.modulemap
  include/new
  include/valarray

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/
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