Adjust the stand-alone build files to accept either CMake files from LLVM_CMAKE_PATH or from LLVM_MAIN_SRC_DIR instead of requiring both. This makes it possible to run libcxx tests on top of installed LLVM and lit, without having to unpack a copy of LLVM sources. Furthermore, it avoids adding duplicate paths.
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- rL LLVM
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Combined with D25076 (on llvm), this lets me run libcxx test suite on top of installed LLVM+lit, without LLVM sources.