[libc++] Add option to disable new/delete overloads when libc++abi provides them.

Summary:
Currently both libc++ and libc++abi provide definitions for operator new/delete. However I believe this is incorrect and that one or the other should offer them.

This patch adds the CMake option `-DLIBCXX_ENABLE_NEW_DELETE_DEFINITIONS` which defaults no `ON` unless `-DLIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS=ON` is specified.



Reviewers: mclow.lists, mehdi_amini, dexonsmith, danalbert, smeenai, mgorny, rmaprath

Reviewed By: mehdi_amini

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D30516

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@296802 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed