[libFuzzer] Use SleepOneSecondTest.cpp for fork-sigusr.test.
ShallowOOMDeepCrash.cpp may hit libFuzzer's RSS limit before the SIGUSR2
is delivered, causing the test to be flaky when bots are under load.
SleepOneSecondTest.cpp will keep running until the signal is delivered.
UNSUPPORTED: darwin, windows
RUN: rm -rf %t
RUN: mkdir -p %t
-RUN: %cpp_compiler %S/ShallowOOMDeepCrash.cpp -o %t/ForkSIGUSR
+RUN: %cpp_compiler %S/SleepOneSecondTest.cpp -o %t/ForkSIGUSR
-RUN: %run %t/ForkSIGUSR -fork=3 -rss_limit_mb=128 -ignore_crashes=1 2>%t/log & export PID=$!
+RUN: %run %t/ForkSIGUSR -fork=3 -ignore_crashes=1 2>%t/log & export PID=$!
RUN: sleep 3
RUN: kill -SIGUSR2 $PID
RUN: sleep 6
