River Riddle c33862b0ed Refactor FunctionAttr to hold the internal function reference by name instead of pointer. The one downside to this is that the function reference held by a FunctionAttr needs to be explicitly looked up from the parent module. This provides several benefits though: ...

* There is no longer a need to explicitly remap function attrs.
      - This removes a potentially expensive call from the destructor of Function.
      - This will enable some interprocedural transformations to now run intraprocedurally.
      - This wasn't scalable and forces dialect defined attributes to override
        a virtual function.
    * Replacing a function is now a trivial operation.
    * This is a necessary first step to representing functions as operations.

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PiperOrigin-RevId: 249510802

2019-06-01 19:56:54 -07:00

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