[cmake] Allow testing against installed LLVM with no sources 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. Differential Revision: https://reviews.llvm.org/D25093 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@284583 91177308-0d34-0410-b5e6-96231b3b80d8
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