Run more passes on constant mir

[fitzgen]

Not very familiar with this code, but everything seems to be working!

r? @eddyb

[eddyb]

LGTM. r? @nikomatsakis

[nikomatsakis]

@bors r+

[bors]

📌 Commit 1129a71 has been approved by nikomatsakis

[bors]

⌛ Testing commit 1129a71 with merge 9bc67ad...

[bors]

💔 Test failed - status-travis

[rust-highfive]

The job x86_64-gnu-distcheck of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:43:34] [RUSTC-TIMING] rustc_const_math test:false 7.285
[00:43:55] [RUSTC-TIMING] proc_macro test:false 27.921
[00:43:55]    Compiling syntax_ext v0.0.0 (file:///checkout/obj/build/tmp/distcheck/src/libsyntax_ext)
[00:44:39] [RUSTC-TIMING] syntax_ext test:false 43.823
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[rust-highfive]

The job x86_64-gnu-distcheck of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:43:34] [RUSTC-TIMING] rustc_const_math test:false 7.285
[00:43:55] [RUSTC-TIMING] proc_macro test:false 27.921
[00:43:55]    Compiling syntax_ext v0.0.0 (file:///checkout/obj/build/tmp/distcheck/src/libsyntax_ext)
[00:44:39] [RUSTC-TIMING] syntax_ext test:false 43.823
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[kennytm]

@bors retry

30 minutes no output

[bors]

⌛ Testing commit 1129a71 with merge c1168be...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: nikomatsakis
Pushing c1168be to master...