Saleem Abdulrasool 90fd8a5d34 stdlib: define and use SWIFT_{,UN}LIKELY ...

Rather than directly using the extension `__builtin_expect`, use a macro
to permit the removal of the builtin on compilers which do not support
this (i.e. cl).  This permits us to build the swift compiler with MSVC
again.

2019-02-24 13:58:18 -08:00

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