auto merge of rust-lang#15516 : brson/rust/tidy, r=alexcrichton

Tidy takes like forever to run. How many times have I wished I didn't have to sit through tidy before seeing my tests fail?

Author: bors

mk/tests.mk

@@ -171,7 +171,7 @@ endif
 # Main test targets
 ######################################################################
 
-check: cleantmptestlogs cleantestlibs tidy check-notidy
+check: cleantmptestlogs cleantestlibs check-notidy tidy
 
 check-notidy: cleantmptestlogs cleantestlibs all check-stage2
 	$(Q)$(CFG_PYTHON) $(S)src/etc/check-summary.py tmp/*.log