[NewPM] Provide method to run all pipeline callbacks, used for -O0

[NewPM] Provide method to run all pipeline callbacks, used for -O0

    Some targets may add required passes via
    TargetMachine::registerPassBuilderCallbacks(). We need to run those even
    under -O0. As an example, BPFTargetMachine adds
    BPFAbstractMemberAccessPass, a required pass.

    This also allows us to clean up BackendUtil.cpp (and out-of-tree Rust
    usage of the NPM) by allowing us to share added passes like coroutines
    and sanitizers between -O0 and other optimization levels.

    Tests are a continuation of those added in
    https://reviews.llvm.org/D89083.

    In order to prevent TargetMachines from adding unnecessary optimization
    passes at -O0, TargetMachine::registerPassBuilderCallbacks() will be
    changed to take an OptimizationLevel, but that will be done separately.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D89158