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Fix incorrect NDEBUG handling in LLVM bindings We currently compile our LLVM bindings using `-DNDEBUG` if debuginfo for LLVM is disabled. However, `NDEBUG` doesn't have any relation to debuginfo, it controls whether assertions are enabled. Split the LLVM_NDEBUG environment variable into two, so that assertions and debuginfo are controlled independently. After this change, `LLVMRustDIBuilderInsertDeclareAtEnd` triggers an assertion failure on LLVM 19 due to an incorrect cast. Fix it by removing the unused return value entirely. r? `@cuviper`