Jordan Rose 6272941c5c Rename "build configurations" to "conditional compilation blocks". ...

...because "build configuration" is already the name of an Xcode feature.

- '#if' et al are "conditional compilation directives".
- The condition is a "conditional compilation expression", or just
  "condition" if it's obvious.
- The predicates are "platform conditions" (including 'swift(>=...)')
- The options set with -D are "custom conditional compilation flags".
  (Thanks, Kevin!)

I left "IfConfigDecl" as is, as well as SourceKit's various "BuildConfig"
settings because some of them are part of the SourceKit request format.
We can change these in follow-up commits, or not.

rdar://problem/19812930

2016-02-12 11:09:26 -08:00

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