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This patch allows us to use cmake to specify a cross compiler for Hexagon. In particular, the patch adds a missing case for the target Hexagon in cmake/config-ix.cmake, and it moves LLVM_DEFAULT_TARGET_TRIPLE and TARGET_TRIPLE variables from cmake/config-ix.cmake to the toplevel CMakeLists.txt to make them available at configure time. Here is the command line that I have used to test my patches: $ cmake -G Ninja -D BUILD_SHARED_LIBS:BOOL=ON -D LLVM_TARGETS_TO_BUILD:STRING=Hexagon -D TARGET_TRIPLE:STRING=hexagon-unknown-linux-gnu -D LLVM_DEFAULT_TARGET_TRIPLE:STRING=hexagon-unknown-linux-gnu -D LLVM_TARGET_ARCH:STRING=hexagon-unknown-linux-gnu -D LLVM_ENABLE_PIC:BOOL=OFF .. $ ninja check llvm-svn: 161504
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