Merging r278029 with version number adjusted:

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r278029 | eugenezelenko | 2016-08-08 10:56:28 -0700 (Mon, 08 Aug 2016) | 4 lines

CMakeLists.txt cleanups: synchronize version and CMake minimum required version with rest of LLVM, consistent spacing.

Differential revision: https://reviews.llvm.org/D23094

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llvm-svn: 278043