[patch] Split parseAssembly in parseAssembly and parseAssemblyInto.

[Rafael Espíndola]

This should restore the functionality of parsing new code into an
existing module without the confusing interface.

I realize that std::unique_ptr<MemoryBuffer> is no the most convenient
structure for the buffer, but I would like to change both functions to
be non-owning in a followup commit.

Cheers,
Rafael
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