Teach the Makefile build system how to handle SOURCES which include
subdirectories. The only thing needed here is to create the appropriate object file directories and add those as dependencies for the compilation rules. As a consequence, factor the non-source-file-specific dependencies for compilation rules into a helper variable. This fixes an issue where the project makefile wasn't actually a dependency of a bunch of compilation make rules for no apparant reason. This should have no observable effect for current makefile usage, but will simplify how we build other libraries and is something CMake already supports. llvm-svn: 194753
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