[libFuzzer] Add --dump-input-on-failure to help diagnose AArch64 failures [NFC]

[peter.smith]

Summary

The fork-siguser.test and fork.test intermittently fail on the AArch64 buildbot. Unfortunately these failures are not reproducible on a similar machine and seem to fail when the machines are under load so I suspect that there isn't much that can be done. Before suggesting the tests be marked unsupported for AArch64 we'd like to see if we can get some more information about the failures to see if it helps us reproduce. This patch adds --dump-input-on-failure to the FileCheck commands to see if we can get some more information about the failures. We should be able to get enough input over a couple of days and can take these out afterwards.

compiler-rt/trunk/test/fuzzer/fork-sigusr.test

 # Check that libFuzzer honors SIGUSR1/SIGUSR2
 # Disabled on Windows which does not have SIGUSR1/SIGUSR2.
 UNSUPPORTED: darwin, windows
 RUN: rm -rf %t
 RUN: mkdir -p %t
 RUN: %cpp_compiler %S/ShallowOOMDeepCrash.cpp -o %t/ForkSIGUSR
 
 RUN: %run %t/ForkSIGUSR -fork=3 -rss_limit_mb=128 -ignore_crashes=1 2>  %t/log & export PID=$!
 RUN: sleep 3
 RUN: pkill -SIGUSR2 -f %t/ForkSIGUSR
 RUN: sleep 3
-RUN: cat %t/log | FileCheck %s
+RUN: cat %t/log | FileCheck %s --dump-input-on-failure
 
 CHECK: libFuzzer: {{.*}}exiting

compiler-rt/trunk/test/fuzzer/fork.test

 # UNSUPPORTED: darwin, freebsd
 BINGO: BINGO
 RUN: %cpp_compiler %S/SimpleTest.cpp -o %t-SimpleTest
-RUN: not %run %t-SimpleTest -fork=1 2>&1 | FileCheck %s --check-prefix=BINGO
+RUN: not %run %t-SimpleTest -fork=1 2>&1 | FileCheck %s --dump-input-on-failure --check-prefix=BINGO
 
 TIMEOUT: ERROR: libFuzzer: timeout
 RUN: %cpp_compiler %S/TimeoutTest.cpp -o %t-TimeoutTest
-RUN: not %run %t-TimeoutTest -fork=1 -timeout=1 -ignore_timeouts=0 2>&1 | FileCheck %s --check-prefix=TIMEOUT
+RUN: not %run %t-TimeoutTest -fork=1 -timeout=1 -ignore_timeouts=0 2>&1 | FileCheck %s --dump-input-on-failure --check-prefix=TIMEOUT
 
 OOM: ERROR: libFuzzer: out-of-memory
 RUN: %cpp_compiler %S/OutOfMemoryTest.cpp -o %t-OutOfMemoryTest
-RUN: not %run %t-OutOfMemoryTest -fork=1 -ignore_ooms=0  -rss_limit_mb=128 2>&1 | FileCheck %s --check-prefix=OOM
+RUN: not %run %t-OutOfMemoryTest -fork=1 -ignore_ooms=0  -rss_limit_mb=128 2>&1 | FileCheck %s --dump-input-on-failure --check-prefix=OOM
 
 # access-violation is the error thrown on Windows. Address will be smaller on i386.
 CRASH: {{SEGV|access-violation}} on unknown address 0x00000000
 RUN: %cpp_compiler %S/ShallowOOMDeepCrash.cpp -o %t-ShallowOOMDeepCrash
-RUN: not %run %t-ShallowOOMDeepCrash -fork=1 -rss_limit_mb=128 2>&1 | FileCheck %s --check-prefix=CRASH
+RUN: not %run %t-ShallowOOMDeepCrash -fork=1 -rss_limit_mb=128 2>&1 | FileCheck %s --dump-input-on-failure --check-prefix=CRASH
 
 MAX_TOTAL_TIME: INFO: fuzzed for {{.*}} seconds, wrapping up soon
 MAX_TOTAL_TIME: INFO: exiting: {{.*}} time:
-RUN: not %run %t-ShallowOOMDeepCrash -fork=1 -rss_limit_mb=128 -ignore_crashes=1 -max_total_time=5 2>&1 | FileCheck %s --check-prefix=MAX_TOTAL_TIME
+RUN: not %run %t-ShallowOOMDeepCrash -fork=1 -rss_limit_mb=128 -ignore_crashes=1 -max_total_time=5 2>&1 | FileCheck %s --dump-input-on-failure --check-prefix=MAX_TOTAL_TIME