tool.drcpusim tests failing on latest Travis Mac

Travis upgraded their Mac images and I'm seeing tool.drcpusim tests failing. I'm not sure why it's non-deterministic -- the code path that runs pinsrd is non-deterministically reached??

https://travis-ci.org/DynamoRIO/dynamorio/jobs/308791074
debug-internal-32: 48 tests passed, **** 3 tests failed, but ignoring 0 for i: ****
	code_api|tool.drcpusim.simple 
	code_api|tool.drcpusim.cpuid-Banias 
	code_api|tool.drcpusim.cpuid-Prescott 

<Invalid Merom instruction "pinsrd" @ libsystem_malloc.dylib+0x31b8.  Aborting.>

https://travis-ci.org/DynamoRIO/dynamorio/jobs/308800033
debug-internal-32: 50 tests passed, **** 1 tests failed, but ignoring 0 for i: ****
	code_api|tool.drcpusim.cpuid-Presler 

<Invalid Presler instruction "pinsrd" @ libsystem_malloc.dylib+0x31b8.  Aborting.>