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ac6bfa6780
Initial restricted implementaiton of the MLIR to LLVM IR translation. Introduce a new flow into the mlir-translate tool taking an MLIR module containing CFG functions only and producing and LLVM IR module. The MLIR features supported by the translator are as follows: - primitive and function types; - integer constants; - cfg and ext functions with 0 or 1 return values; - calls to these functions; - basic block conversion translation of arguments to phi nodes; - conversion between arguments of the first basic block and function arguments; - (conditional) branches; - integer addition and comparison operations. Are NOT supported: - vector and tensor types and operations on them; - memrefs and operations on them; - allocations; - functions returning multiple values; - LLVM Module triple and data layout (index type is hardcoded to i64). Create a new MLIR library and place it under lib/Target/LLVMIR. The "Target" library group is similar to the one present in LLVM and is intended to contain all future public MLIR translation targets. The general flow of MLIR to LLVM IR convresion will include several lowering and simplification passes on the MLIR itself in order to make the translation as simple as possible. In particular, ML functions should be transformed to CFG functions by the recently introduced pass, operations on structured types will be converted to sequences of operations on primitive types, complex operations such as affine_apply will be converted into sequence of primitive operations, primitive operations themselves may eventually be converted to an LLVM dialect that uses LLVM-like operations. Introduce the first translation test so that further changes make sure the basic translation functionality is not broken. PiperOrigin-RevId: 222400112