Function llvm_sys::debuginfo::LLVMDIBuilderInsertDbgValueBefore

pub unsafe extern "C" fn LLVMDIBuilderInsertDbgValueBefore(
    Builder: LLVMDIBuilderRef, 
    Val: LLVMValueRef, 
    VarInfo: LLVMMetadataRef, 
    Expr: LLVMMetadataRef, 
    DebugLoc: LLVMMetadataRef, 
    Instr: LLVMValueRef
) -> LLVMValueRef

Insert a new llvm.dbg.value intrinsic call before the given instruction.