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Remove std::shared_ptr::allocate_shared

Authored by zoecarver on Feb 25 2020, 4:50 PM.

Description

Remove std::shared_ptr::allocate_shared

std::shared_ptr::allocate_shared isn't in the standard. This commit removes it from libc++. It updates std::allocate_shared to use __create_with_cntrl_block.

Differential Revision: https://reviews.llvm.org/D66178