Fix & ref ident patterns for DSTs

[Aatch]

We shouldn't load DSTs when recursing into the sub-pattern of & ref ident.

Fixes #30277

[rust-highfive]

r? @pnkfelix

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[pnkfelix]

@bors r+

[bors]

📌 Commit 93154dd has been approved by pnkfelix

[bors]

⌛ Testing commit 93154dd with merge 501e60d...

[bors]

💔 Test failed - auto-mac-64-nopt-t

[alexcrichton]

@bors: retry

On Fri, Dec 11, 2015 at 1:26 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-mac-64-nopt-t
http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/7390

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#30279 (comment).

[bors]

⌛ Testing commit 93154dd with merge c80623f...

[bors]

💔 Test failed - auto-mac-64-opt

[alexcrichton]

@bors: retry

On Fri, Dec 11, 2015 at 11:48 PM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-mac-64-opt
http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/7363

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#30279 (comment).

[bors]

⌛ Testing commit 93154dd with merge e583ab6...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt