Huisheng Liu b47cfec5d0 fix compilation error on MSVC (#5458)
Summary:
"__attribute__((__weak__))" was introduced in port\jemalloc_helper.h. It's not supported by Microsoft VS 2015, resulting in compile error. This fix adds a #if branch to work around the compile issue.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5458

Differential Revision: D15827285

fbshipit-source-id: 8c5f7ad31de1ac677bd96f16c4450767de834beb
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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.