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This commits moves all OpenCL builtins under a top-level 'opencl' directory, akin to how the CLC builtins are organized. This new structure aims to better convey the separation of the two layers and that 'CLC' is not a subset of OpenCL or a libclc target. In doing so this commit moves the location of the 'lib' directory to match CLC: libclc/generic/lib/ becomes libclc/opencl/lib/generic/. This allows us to remove some special casing in CMake and ensure a common directory structure. It also tries to better communicate that the OpenCL headers are libclc-specific OpenCL headers and should not be confused with or used as standard OpenCL headers. It does so by ensuring includes are of the form <clc/opencl/*>. It might be that we don't specifically need the libclc OpenCL headers and we simply could use clang's built-in declarations, but we can revisit that later. Aside from the code move, there is some code formatting and updating a couple of OpenCL builtin includes to use the readily available gentype helpers. This allows us to remove some '.inc' files.