Download pre-compiled AOTriton from GitHub unless AOTRITON_INSTALL_FROM_SOURCE=1 is set #136786
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PyTorch community members have reported issues with building PyTorch from source for ROCm in an environment that doesn't have aotriton pre-installed, because aotriton is only installed in the CI/manywheel docker images. Building aotriton from source can take ~45 minutes.
This PR fixes the issue by downloading the aotriton tarball in such scenarios, unless the user explicitly wants to build aotriton from source using the AOTRITON_INSTALL_FROM_SOURCE=1 env var