[sanitizer] [SystemZ] Add virtual space size.

[• koriakin]

Summary

This teaches sanitizer_common about s390 and s390x virtual space size.
s390 is unusual in that it has 31-bit virtual space.

[eugenis]

Please upload the patches with more context,
http://llvm.org/docs/Phabricator.html#requesting-a-review-via-the-web-interface

(this one is fine)

[eugenis]

LGTM

compiler-rt/trunk/lib/sanitizer_common/sanitizer_posix.cc

# elif defined(__powerpc64__) || defined(__aarch64__)
   // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
   // Note that with 'ulimit -s unlimited' the stack is moved away from the top
   // of the address space, so simply checking the stack address is not enough.
   // This should (does) work for both PowerPC64 Endian modes.
   // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
   return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1;
 # elif defined(__mips64)
   return (1ULL << 40) - 1;  // 0x000000ffffffffffUL;
+# elif defined(__s390x__)
+  return (1ULL << 53) - 1;  // 0x001fffffffffffffUL;
 # else
   return (1ULL << 47) - 1;  // 0x00007fffffffffffUL;
 # endif
 #else  // SANITIZER_WORDSIZE == 32
+# if defined(__s390__)
+  return (1ULL << 31) - 1;  // 0x7fffffff;
+# else
   uptr res = (1ULL << 32) - 1;  // 0xffffffff;
   if (!common_flags()->full_address_space)
     res -= GetKernelAreaSize();
   CHECK_LT(reinterpret_cast<uptr>(&res), res);
   return res;
+# endif
 #endif  // SANITIZER_WORDSIZE
 }
 
 void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
   size = RoundUpTo(size, GetPageSizeCached());
   uptr res = internal_mmap(nullptr, size,
                            PROT_READ | PROT_WRITE,
                            MAP_PRIVATE | MAP_ANON, -1, 0);

compiler-rt/trunk/lib/sanitizer_common/tests/sanitizer_allocator_test.cc

typedef SizeClassAllocator64<
   kAllocatorSpace, kAllocatorSize, 16, DefaultSizeClassMap> Allocator64;
 
 typedef SizeClassAllocator64<
   kAllocatorSpace, kAllocatorSize, 16, CompactSizeClassMap> Allocator64Compact;
 #elif defined(__mips64)
 static const u64 kAddressSpaceSize = 1ULL << 40;
 #elif defined(__aarch64__)
 static const u64 kAddressSpaceSize = 1ULL << 39;
+#elif defined(__s390x__)
+static const u64 kAddressSpaceSize = 1ULL << 53;
+#elif defined(__s390__)
+static const u64 kAddressSpaceSize = 1ULL << 31;
 #else
 static const u64 kAddressSpaceSize = 1ULL << 32;
 #endif
 
 static const uptr kRegionSizeLog = FIRST_32_SECOND_64(20, 24);
 static const uptr kFlatByteMapSize = kAddressSpaceSize >> kRegionSizeLog;
 
 typedef SizeClassAllocator32<