T11627[ab] fail on some Darwin environments

As of d6216443 I am seeing T11627a and T11627b fail in the prof_hr way on Darwin under CircleCI (but not Harbormaster!):

Wrong exit code for T11627b(prof_hr)(expected 0 , actual 139 )
Stderr ( T11627b ):
/bin/sh: line 1: 73247 Segmentation fault: 11  ./T11627b +RTS -hr -RTS +RTS -i0 -RTS
*** unexpected failure for T11627b(prof_hr)

Trac metadata

Trac field	Value
Version	8.4.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

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