[Refactor] Move llvm runtime build for archs from C++ to cmake. #2524
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When we build python packages, we used to call
ti.core.compile_runtimes()
to build llvm runtime for archs, but this can be conveniently done in cmake instead of invokingclang/llvm-as
from C++.This PR follows the C++ logic that we always build for host arch, and also cuda if it's available.
Our C++ code is a bit confusing in where to put the final
runtime_arm64.bc
(it's copied over a few times). AFAIK the hardcoded path in cmake is sufficient for now.