[bug] Fix bug that building with TI_WITH_LLVM=OFF will fail #4043
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Related issue = fix #3999
Taichi isn't at a state that can be built easily without LLVM at all. Currently, the
-DTI_WITH_LLVM=OFF
doesn't mean that Taichi will be built without using LLVM at all. Fixing this problem completely in the future version is that we should consider, which is difficult but necessary.