[roll] Roll llvm-project/libc [libc] Use the NVIDIA device allocator for GPU malloc (#124277) Summary: This is a blocker on another patch in the OpenMP runtime. The problem is that NVIDIA truly doesn't handle RPC-based allocations very well. It cannot reliably update the MMU while a kernel is running and it will usually deadlock if called from a separate thread due to internal use of TLS. This patch just removes the definition of `malloc` and `free` for NVPTX. The result here is that they will be undefined, which is the cue for the `nvlink` linker to define them for us. So, as far as `libc` is concerned it still implements malloc. GitOrigin-RevId: b2986f256013199bcc6b7b96363fd06d9d28048a Original-Revision: 15c0944acb56faa6b9409a9bafa997ff2caed7bd Change-Id: I2f4825de92c0ce7a03ec7e4d42445ea23829893d
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