[llvm-commits] [PATCH][CMake] Adding support for find_package().

[arrowdodger]

This patch do following things:

- Renames LLVM.cmake to LLVMConfig.cmake so it can be picked up by
find_package() call.
- Adds into LLVMConfig.cmake some more export variables.
- Adds new file LLVMConfigVersion.cmake to be processed by find_package().
- Reflects renaming in cmake/modules/CMakeLists.txt.

There are two comments "#remove this?"
1. In CMakeLists.txt:36.
    install() installs the same files as install above. Looks like leftover
from earlier code refactoring.

2. In LLVMConfig.cmake.in:3.
    This var now is duplicating LLVMConfigVersion.cmake.

Also, attaching patch to clang CMakeLists.txt.
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