FunctionCompileExportByteArray
FunctionCompileExportByteArray[fspec] gives a byte array of binary LLVM code obtained by compiling the function specification fspec.
FunctionCompileExportByteArray[defs,fspec] uses the auxiliary definitions defs for compilation.
FunctionCompileExportByteArray[fspec,"format"] gives a byte array of binary code in the specified format.
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