llvm-project

fbd7c500 - [libc] Repurpose `LIBC_GPU_BUILD` option to enable the new format (#82848)

[libc] Repurpose `LIBC_GPU_BUILD` option to enable the new format (#82848) Summary: We previously used the `LIBC_GPU_BUILD` option to control whether or not the GPU build was enabled. This was recently replaced with a new format that allows treating the GPU targets more directly. However, the new format is somewhat difficult to use for people unfamiliar with the runtimes builds, and the removal of this option somewhat broke backward compatibility. This patch seeks to simplify enabling the GPU build by repurposing the old enabling option and convert it to the new interface. Unsure what the rules are here, since this is technically a `LIBC` option living in the LLVM location.