Setup valgrind for mac mem check.

8 jobs for aptool_fortification in 12 minutes and 10 seconds
Name Stage Failure
failed
mac_llvm_testing Test
radix    =  59.14 sec*proc (39 tests)

Total Test time (real) = 59.17 sec
UpdateCTestConfiguration from :/Users/jap/builds/df563b7c/1/jap/radix/build/DartConfiguration.tcl
Parse Config file:/Users/jap/builds/df563b7c/1/jap/radix/build/DartConfiguration.tcl
Memory check project /Users/jap/builds/df563b7c/1/jap/radix/build
Memory checker (MemoryCheckCommand) not set, or cannot find the specified program.
Errors while running CTest
ERROR: Job failed: exit status 1
failed
mac_gcc_testing Test
radix    =  55.45 sec*proc (42 tests)

Total Test time (real) = 55.48 sec
UpdateCTestConfiguration from :/Users/jap/builds/df563b7c/0/jap/radix/build/DartConfiguration.tcl
Parse Config file:/Users/jap/builds/df563b7c/0/jap/radix/build/DartConfiguration.tcl
Memory check project /Users/jap/builds/df563b7c/0/jap/radix/build
Memory checker (MemoryCheckCommand) not set, or cannot find the specified program.
Errors while running CTest
ERROR: Job failed: exit status 1