Jordan Rose e4e4f3e4f5 Break Driver's dep on Frontend: make createCompilerInvocation uglier ...

But not even that much uglier; at all three call sites this will save
an allocation, and for the most important one (SourceKit) we can now
avoid creating a temporary CompilerInvocation just to copy into a
longer-lived one.

With this change, Driver no longer depends on Frontend, which means...
well, slightly faster builds of the compiler itself, but not much
else.

2018-08-27 20:47:58 -07:00

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