[PATCH] [libcxx] Consolidate new/delete replacement in tests and disable it when using sanitizers.

[Eric Fiselier]

Hi mclow.lists, danalbert, jroelofs,

MSAN and ASAN also replace new/delete which leads to a link error in these tests. Currently they are unsupported but I think it would be useful if these tests could run with sanitizers.

This patch creates a support header that consolidates the new/delete replacement functionality and adds an assertion macro to be used along side it.
When we are using sanitizers new and delete are no longer replaced and the assertion macro becomes a nop.

http://reviews.llvm.org/D6562

Files:
  test/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.dtor/dtor.pass.cpp
  test/localization/locale.stdcvt/codecvt_utf16.pass.cpp
  test/localization/locale.stdcvt/codecvt_utf8.pass.cpp
  test/localization/locales/locale.convenience/conversions/conversions.buffer/ctor.pass.cpp
  test/localization/locales/locale/locale.cons/default.pass.cpp
  test/localization/locales/locale/locale.members/combine.pass.cpp
  test/support/count_new.hpp
  test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp
  test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F.pass.cpp
  test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/F_assign.pass.cpp
  test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_function.pass.cpp
  test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.pass.cpp
  test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy.pass.cpp
  test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_assign.pass.cpp
  test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign.pass.cpp
  test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.mod/swap.pass.cpp
  test/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
  test/utilities/memory/default.allocator/allocator.members/construct.pass.cpp
  test/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/make_shared.pass.cpp
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