[llvm] Implement the BPF ABI (#194031) Implements BPFTargetInfo, the first target-specific ABI lowering for the LLVM ABI library introduced in #158329. BPFTargetInfo mirrors the BPF ABI rules currently encoded in `clang::BPFABIInfo` (clang/lib/CodeGen/Targets/BPF.cpp), but operates entirely on `llvm::abi` types, keeping the logic frontend-independent: - Empty aggregates and void returns are ignored - Aggregates ≤64 bits are coerced to an aligned integer type - Aggregates 65–128 bits are coerced to [2 x i64] - Aggregates >128 bits and oversized _BitInt types are passed/returned indirectly - Promotable integers are sign/zero extended - All aggregate returns are indirect Also adds the `createBPFTargetInfo` factory function declaration to TargetInfo.h.
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