formattedRawOstream: Create and access LLVM output streams
In doktorschiwago/Rllvm2: Interface to llvm for dynamically compiling native code.

These functions allow us to create and use LLVM output streams for generating content, e.g. code.

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formattedRawOstream(stream, delete = FALSE, finalize = TRUE)
rawStringOstream(value = "")
rawFDOstream(filename)

`stream`	the raw ostream which
`delete`	a logical value indicating whether to release/garbage collect the raw stream `stream`.
`finalize`	a logical value to indicate whether to register a finalizer for the stream
`value`	an initial string, typically empty
`filename`	the name of the file to which the contents should be written