Dan Gohman c1eee1d659 [WebAssembly] Add a __wasi__ target macro ...

This adds a `__wasi__` macro for the wasi OS, similar to `__linux__` etc. for
other OS's.

Differential Revision: https://reviews.llvm.org/D57155

llvm-svn: 352105

2019-01-24 21:05:11 +00:00

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