[ROCm] implement hermetic rocm dependency #64
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This change has as a goal to introduce an external dependency to the rocm library and tools.
Building xla with the hermetic rocm is done by using these env variables:
--repo_env=OS=ubuntu_20.04 --repo_env=ROCM_VERSION=6.2.0
One has to provie OS version and ROCm version to initialize a proper rocm repository.
If these flags are not set then default ROCm installation will be used to build XLA.
Sample command:
bazel --output_base=./bazel-build-dir run --config=rocm //xla/... --repo_env=OS=ubuntu_20.04 --repo_env=ROCM_VERSION=6.2.0
@xla-rotation could you review my PR please?