[+0-all-args] Fixup more of Reflection.mm.
[+0-all-args] Fixup more of Reflection.mm.

This mainly was just removing #if{,n}def in favor of SWIFT_CC_* macros. But I
did add a missing retain needed in swift_StructMirror_subscript since owner is
no longer passed at +1 and mirrors consume the owner.

rdar://34222540

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