Saleem Abdulrasool 9b8310c3f9 build: extract compiler swap into a helper ...

This is needed as SwiftSyntaxParser also needs to be built with clang as
it uses blocks unconditionally.  However, building with cl provides much
better diagnostics and debugging as well as a significantly faster
build (~15-20% faster) as well as a faster compiler.

2019-03-27 15:04:49 -07:00

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