Chris Bieneman 51d3515b04 [CMake] Revive LLVM_*_DIRS variables
This is a partial revert of r280013. Brad King pointed out these variable names are matching CMake conventions, so we should preserve them.

I've also added a direct mapping of the LLVM_*_DIR variables which we need to make projects support building in and out of tree.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280380 91177308-0d34-0410-b5e6-96231b3b80d8
2016-09-01 16:43:39 +00:00
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