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This avoids having to specify the location of all individual tools. In current builds, one may want to specify LLVM_TABLEGEN, CLANG_TABLEGEN, LLDB_TABLEGEN, LLVM_CONFIG_PATH, CLANG_PSEUDO_GEN and CLANG_TIDY_CONFUSABLE_CHARS_GEN; specifying just the base directory containing all of them is much more convenient. Factorize the code for setting up use of a tool that is used during the build (which either is newly built in the same build, or built in a separate nested cmake build - when cross compiling or when e.g. optimized tablegen is requested - or used from an existing prebuilt binary). Differential Revision: https://reviews.llvm.org/D131052