libcxx: Disable CFI in function std::get_temporary_buffer.

The specification of this function mandates a cast to uninitialized
T*, which is forbidden under CFI.

Differential Revision: https://reviews.llvm.org/D42146

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@322744 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed