[compiler-rt] Disable fuzzer large.test when LLVM_ENABLE_EXPENSIVE_CHECKS=ON.

[arphaman]

Summary

This test is timing out on Green Dragon http://green.lab.llvm.org/green/job/clang-stage1-cmake-RA-expensive/
and looks like it's not executed on other bots with expensive checks
enabled
http://lab.llvm.org:8011/builders/llvm-clang-x86_64-expensive-checks-ubuntu
http://lab.llvm.org:8011/builders/llvm-clang-x86_64-expensive-checks-win

I don't know if it is the right approach or if it defeats the purpose of
the test. So I want to discuss if it is a reasonable fix and then I can
polish the code. So far I haven't tested it but it should convey my
intention.

rdar://problem/56377397

[vsapsai]

Abandon in favor of D70288.

[arphaman]

LGTM. Based on the analysis I did on the bot, the test takes 2 hours to compile the file, and the majority of time it spent in IR/MIR verifiers. For now it would make sense to disable this test for expensive checks.

[arphaman]

Pass LLVM_ENABLE_EXPENSIVE_CHECKS through over to the lit configurator.

[vsapsai]

Looks good to me.

[MatzeB]

FWIW: I also had several instances where fuzzer/large.test times out in the phabricator pre-commit tests. Example: https://buildkite.com/llvm-project/premerge-checks/builds/83760#d1da7a7f-1beb-4495-a338-9802b6108a7d

Those don't even use EXPENSIVE_CHECKS I believe.

compiler-rt/test/fuzzer/large.test

+UNSUPPORTED: expensive_checks
+
 RUN: %cpp_compiler %S/LargeTest.cpp -o %t-LargeTest
 RUN: %run %t-LargeTest -runs=10000
 
 CHECK: pages of counters where protected; libFuzzer's SEGV handler must be installed

compiler-rt/test/lit.common.cfg.py

 if config.android or (config.target_arch not in ['arm', 'armhf', 'aarch64']):
   config.available_features.add('stable-runtime')
 
 if config.asan_shadow_scale:
   config.available_features.add("shadow-scale-%s" % config.asan_shadow_scale)
 else:
   config.available_features.add("shadow-scale-3")
 
+if config.expensive_checks:
+  config.available_features.add("expensive_checks")
+
 # Propagate the LLD/LTO into the clang config option, so nothing else is needed.
 run_wrapper = []
 target_cflags = [getattr(config, 'target_cflags', None)]
 extra_cflags = []
 
 if config.use_lto and config.lto_supported:
   run_wrapper += config.lto_launch
   extra_cflags += config.lto_flags

compiler-rt/test/lit.common.configured.in

 set_default("use_lto", config.use_thinlto)
 set_default("use_newpm", False)
 set_default("android", @ANDROID_PYBOOL@)
 set_default("android_ndk_version", @ANDROID_NDK_VERSION@)
 set_default("android_serial", "@ANDROID_SERIAL_FOR_TESTING@")
 set_default("android_files_to_push", [])
 set_default("have_rpc_xdr_h", @HAVE_RPC_XDR_H@)
 set_default("gwp_asan", @COMPILER_RT_HAS_GWP_ASAN_PYBOOL@)
+set_default("expensive_checks", @LLVM_ENABLE_EXPENSIVE_CHECKS_PYBOOL@)
 config.available_features.add('target-is-%s' % config.target_arch)
 
 if config.enable_per_target_runtime_dir:
   set_default("target_suffix", "")
 else:
   set_default("target_suffix", "-%s" % config.target_arch)
 
 set_default("have_zlib", "@HAVE_LIBZ@")