Smaller refactor svh

[richo]

This is the first half of the implementation of what I set out to do in #26629.

This will make the location of attrs in crates not affect their hash values any more, although it doesn't expose a public way to do this outside of an entire Svh yet, which is how I intended to implement the dupe attribute lint.

For posterity, I did the yolo science with: https://gist.github.com/richo/f750855a762804e2b3e9

r? @alexcrichton

Ping #14132

[richo]

(The assertion that this closes #14132 was based on yolo-science™, updated to reflect that)

[brson]

@bors r+ Nice improvements.

[bors]

📌 Commit de81de5 has been approved by brson

[richo]

@brson you'll need to r-, I ran make check overnight and it breaks some svh tests (in the same way that my other changes did, it's upset about the crates hashes changing)

[Gankra]

@bors r-

On Sun, Aug 2, 2015 at 11:54 AM, Richo Healey notifications@github.com
wrote:

@brson https://github.com/brson you'll need to r-, I ran make check
overnight and it breaks some svh tests (in the same way that my other
changes did, it's upset about the crates hashes changing)

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[alexcrichton]

Closing due to inactivity, but feel free to send a new PR with tests fixed!