Don't identity-alias imports

[brandond]

Fixes stuff like context "context" and http "net/http".

Ref:

• Performance: Use FormatOnly on imports #277 (comment)

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[brandond]

@thockin any chance of getting this upstreamed or should I just close it?

[thockin]

I'm not sure this is sufficient. It's rare but sometimes the package name and the leaf of the path are not the same. Looking at this code, I doubt we handle it properly in the absence of an alias like this.

This is one area where my big refactoring last year dared not go - the importer logic is twisty. I figured it's generated code, so who cares, really. I am not against fixing it, but I think that a change like this will explode in the above case.

@jpbetz