[CMake] Create an install-distribution target driven by LLVM_DISTRIBUTION_COMPONENTS
The idea here is to provide a customizable install target that only depends on building the things you actually want to install. It relies on each component being installed having an auto-generated install-${component}, which in turn depends only on the target being installed.
This is fundamentally a workaround for the fact that CMake generates build files which have their "install" target depend on the "all" target. This results in "ninja install" building a bunch of unneeded things.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261681 91177308-0d34-0410-b5e6-96231b3b80d8
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