[PATCH] D117973: [cmake] Support custom package install paths

[John Ericson via Phabricator via llvm-commits]

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Firstly, we we make an additional GNUInstallDirs-style variable. With
NixOS, for example, this is crucial as we want those to go in
`${dev}/lib/cmake` not `${out}/lib/cmake` as would a cmake subdir of the
"regular" libdir.

Secondly, we make *Config.cmake robust to absolute package install
paths. We for NixOS will in fact be passing them absolute paths to make
the `${dev}` vs `${out}` distinction mentioned above, and the
GNUInstallDirs-style variables are suposed to support absolute paths in
general so it's good practice besides the NixOS use-case.

Thirdly, we make `${project}_INSTALL_PACKAGE_DIR` CACHE PATHs like other
install dirs are.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D117973

Files:
  clang/cmake/modules/CMakeLists.txt
  cmake/Modules/FindPrefixFromConfig.cmake
  cmake/Modules/GNUInstallPackageDir.cmake
  flang/cmake/modules/CMakeLists.txt
  lld/cmake/modules/CMakeLists.txt
  llvm/cmake/modules/AddLLVM.cmake
  llvm/cmake/modules/CMakeLists.txt
  mlir/cmake/modules/CMakeLists.txt
  polly/cmake/CMakeLists.txt

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