[patch] Simply ia64-sigill.exp

[Yao Qi]

In my port, pthread_cond_signal/pthread_cond_wait don't work properly,
and some tests in ia64-sigill.exp fails.

This patch is to replace calls to pthread_cond_signal/pthread_cond_wait
with "set-and-check" on variable thread1_tid and thread2_tid, to still
keep the happen-before relationship between threads.

Test result is unchanged on x86_64-unknown-linux-gnu.  OK for mainline?

-- 
Yao (齐尧)
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