https://lab.llvm.org/buildbot#builders/56/builds/3201 failed with a link error being unable to initialize the disassembler. Oddly, this bot is the *only* bot which appears to have failed in this way. (A bunch sent warnings, but that appears to be spurious due to cmake rebuilds on incremental bots.) Why only polly would witness this is an excercise for the reader - because I have no clue.
AllTargetsAsmParsers
AllTargetsCodeGens
AllTargetsDescs
+ AllTargetsDisassemblers
AllTargetsInfos
MC
MCParser