Dmitri Smirnov 36074ba5de Enable cacheline_aligned_alloc() to allocate from jemalloc if enabled.
Summary:
Reuse WITH_JEMALLOC option in preparation for module search unification.
  Move jemalloc overrides into a separate .cc
  Remote obsolete JEMALLOC_NOINIT option.
Closes https://github.com/facebook/rocksdb/pull/3078

Differential Revision: D6174826

Pulled By: yiwu-arbug

fbshipit-source-id: 9970a0289b4490272d15853920d9d7531af91140
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This directory contains interfaces and implementations that isolate the
rest of the package from platform details.

Code in the rest of the package includes "port.h" from this directory.
"port.h" in turn includes a platform specific "port_<platform>.h" file
that provides the platform specific implementation.

See port_posix.h for an example of what must be provided in a platform
specific header file.