Justin Bogner 8c188e7e38 CMake: Explicitly #undef LLVM_REVISION rather than using a blank file
Including a blank file is confusing and makes it look like something
went wrong. Rather than requiring people know why this is blank, let's
just make it explicitly #undef the macro that it would define if it
weren't empty.

llvm-svn: 324659
2018-02-08 22:19:00 +00:00
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