Add rustc-stageN targets to rustbuild

[sanxiyn]

No description provided.

[rust-highfive]

r? @brson

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[alexcrichton]

@bors: r+ 58c581c

[bors]

⌛ Testing commit 58c581c with merge c95ee0e...

[bors]

💔 Test failed - auto-win-msvc-64-opt-rustbuild

[alexcrichton]

@bors: retry

• Cascading failure on bots when interrupted when performing git operations #34595

On Fri, Jul 1, 2016 at 5:50 AM, bors notifications@github.com wrote:

💔 Test failed - auto-win-msvc-64-opt-rustbuild
https://buildbot.rust-lang.org/builders/auto-win-msvc-64-opt-rustbuild/builds/1629

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[bors]

⌛ Testing commit 58c581c with merge 9f49485...

[bors]

💔 Test failed - auto-win-gnu-32-opt-rustbuild

[alexcrichton]

@bors https://github.com/bors: retry

• Cascading failure on bots when interrupted when performing git operations #34595 Cascading failure on bots when interrupted when performing git operations #34595

On Fri, Jul 1, 2016 at 12:52 PM, bors notifications@github.com wrote:

💔 Test failed - auto-win-gnu-32-opt-rustbuild
https://buildbot.rust-lang.org/builders/auto-win-gnu-32-opt-rustbuild/builds/1644

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