[libc++] Revert __uninitialized_buffer changes

This patch reverts the following commits:

    015cd317eaed28a923d14a33c9d6739012a688be (add missing HIDE_FROM_ABI)
    420a204d52205f1277a8d5df3dbafac6082e02e2 (add _LIBCPP_NO_CFI)
    31eeba3f7c0e2ef4a21c07da9326a4ae1a8de7e2 (add __uninitialized_buffer)

It also reverts a small part of b935ab8e747cf52ff12471879460206a9f433eea
which is required to make the stable_partition.pass.cpp test pass on GCC.

Some issues were pointed out in https://reviews.llvm.org/D152208 and
in https://reviews.llvm.org/D154017, so I am reverting this patch
until we have time to weigh the various solutions and get consensus
on the design of the API.

Differential Revision: https://reviews.llvm.org/D154161

1 files changed, 4 insertions, 0 deletions

diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/stable_partition.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/stable_partition.pass.cpp
index 5fc6633..85d12d0 100644
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/stable_partition.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/stable_partition.pass.cpp
@@ -282,6 +282,9 @@ test()
     assert(array[9] == P(0, 2));
   }
 #if TEST_STD_VER >= 11 && !defined(TEST_HAS_NO_EXCEPTIONS)
+  // TODO: Re-enable this test once we're no longer using get_temporary_buffer().
+  // For now it trips up GCC due to the use of always_inline.
+#if 0
   { // check that the algorithm still works when no memory is available
     std::vector<int> vec(150, 3);
     vec[5]                             = 6;
@@ -297,6 +300,7 @@ test()
     assert(std::is_partitioned(vec.begin(), vec.end(), [](int i) { return i < 5; }));
     getGlobalMemCounter()->reset();
   }
+#endif
 #endif // TEST_STD_VER >= 11 && !defined(TEST_HAS_NO_EXCEPTIONS)
 }