[PATCH] MIR Serialization: Serialize the machine basic block successor weights.

[Alex L]

Hi,

This patch serializes the machine basic block successor's weights.
This patch adds a new attribute 'successors-and-weights' to the
machine basic block YAML mapping. The new attribute is used
to store an array of successors and their corresponding weights.
Example:

    successors-and-weights: [ { block: '%bb.1.less', weight: 16 }, { block:
'%bb.2.exit', weight: 16 } ]

The old attribute 'successors' still can be used to specify the
machine basic block's successors when those successors don't
have any weights.

Thanks,
Alex
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