Bump LLVM from 13.0.0 to 15.0.0#901

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xudon9 wants to merge 3 commits intoSVF-tools:masterfrom

Commits on Nov 11, 2022

Bumped LLVM from 13.0 to 15.0; Eliminate unused variable problems caused by assertions in Release mode for some compilers
xudon9
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Unused varaible error fix
xudon9
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fix compilation error due to deref of nullptr
xudon9
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