Default to fifo for cray compiler
Default to fifo for cray compiler

We have some things to address with qthreads and the cray compiler that are
causing noise in nightly testing (because cce doesn't support inline asm, but
qthreads doesn't properly detect or handle this.)

Until we get the issue resolved, default to fifo to quiet nightly testing.

CoryMcCartan/chapel,hildeth/chapel,hildeth/chapel,CoryMcCartan/chapel,chizarlicious/chapel,CoryMcCartan/chapel,chizarlicious/chapel,hildeth/chapel,chizarlicious/chapel,CoryMcCartan/chapel,chizarlicious/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,hildeth/chapel,hildeth/chapel,chizarlicious/chapel,chizarlicious/chapel,CoryMcCartan/chapel,chizarlicious/chapel,hildeth/chapel,hildeth/chapel