[lsan] Reenable lsan tests on ARM bots

[m.ostapenko]

Summary

This patch addresses pr32636. Enable lsan tests on ARM bots filtering out Thumb targets.
Tested locally on ARM Arndale board in two configurations:

1. CFLAGS="-march=armv7-a"

Testing Time: 37.57s
  Expected Passes    : 69
  Unsupported Tests  : 7

2. CFLAGS="-march=armv7-a -mthumb"

Testing Time: 0.16s
  Unsupported Tests  : 76

[rengolin]

Thanks for looking into this. LGTM!

[m.ostapenko]

Thanks! Watching for buildbots...

compiler-rt/trunk/test/asan/lit.cfg

 config.substitutions.append( ("%xdynamiclib_namespec", '%basename_t.dynamic') )
 
 # Allow tests to use REQUIRES=stable-runtime.  For use when you cannot use XFAIL
 # because the test hangs. Adding armhf as we now have two modes.
 if config.target_arch != 'arm' and config.target_arch != 'armhf' and config.target_arch != 'aarch64':
   config.available_features.add('stable-runtime')
 
 # Fast unwinder doesn't work with Thumb
-if not re.match('-mthumb', config.target_cflags):
+if re.search('mthumb', config.target_cflags) is not None:
   config.available_features.add('fast-unwinder-works')
 
 # Turn on leak detection on 64-bit Linux.
 if config.host_os == 'Linux' and (config.target_arch == 'x86_64' or config.target_arch == 'i386'):
   config.available_features.add('leak-detection')
 
 # Set LD_LIBRARY_PATH to pick dynamic runtime up properly.
 push_dynamic_library_lookup_path(config, config.compiler_rt_libdir)

compiler-rt/trunk/test/lsan/lit.common.cfg

def build_invocation(compile_flags):
   return " " + " ".join([config.clang] + compile_flags) + " "
 
 config.substitutions.append( ("%clang ", build_invocation(clang_cflags)) )
 config.substitutions.append( ("%clangxx ", build_invocation(clang_cxxflags)) )
 config.substitutions.append( ("%clang_lsan ", build_invocation(clang_lsan_cflags)) )
 config.substitutions.append( ("%clangxx_lsan ", build_invocation(clang_lsan_cxxflags)) )
 
 # LeakSanitizer tests are currently supported on x86-64 Linux, arm Linux and mips64 Linux only.
-# LSAN breaks on Thumb, so disabling from all ARM targets until we sort this out. PR32636.
-if config.host_os not in ['Linux'] or config.host_arch not in ['x86_64', 'mips64']:
+if config.host_os not in ['Linux'] or config.host_arch not in ['x86_64', 'mips64', 'arm', 'armhf', 'armv7l']:
   config.unsupported = True
 
 # Don't support Thumb due to broken fast unwinder
-if re.match('-mthumb', config.target_cflags):
+if re.search('mthumb', config.target_cflags) is not None:
   config.unsupported = True
 
 config.suffixes = ['.c', '.cc', '.cpp']