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MIR Serialization: Serialize the list of machine basic blocks with simple…

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MIR Serialization: Serialize the list of machine basic blocks with simple attributes.

This commit implements the initial serialization of machine basic blocks in a
machine function. Only the simple, scalar MBB attributes are serialized. The
reference to LLVM IR's basic block is preserved when that basic block has a name.

Reviewers: Duncan P. N. Exon Smith

Differential Revision: http://reviews.llvm.org/D10465

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