Replacing @_transparent with @inline(__always)
Replacing @_transparent with @inline(__always)

Mandatory inlining of a few very frequently used functions caused the
SIL size explosion, which in turn made the inliner use up to 6Gb of
memory to compile the standard library. @inline(__always) helps avoid
that without affecting benchmark results.

Related to: <rdar://problem/31375011>

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