[compiler-rt] Re-active unittest previously broken on windows.

[etienneb]

Summary

These tests are working fine.

[rnk]

lgtm

Looks like Timur added these ifdefs in r208698, which probably predates implementing more of the Mmap* related functions.

lib/sanitizer_common/tests/sanitizer_allocator_test.cc

 }
 
 #if SANITIZER_CAN_USE_ALLOCATOR64
 TEST(SanitizerCommon, SizeClassAllocator64Overflow) {
   EXPECT_DEATH(FailInAssertionOnOOM<Allocator64>(), "Out of memory");
 }
 #endif
 
-#if !defined(_WIN32)  // FIXME: This currently fails on Windows.
 TEST(SanitizerCommon, LargeMmapAllocator) {
   LargeMmapAllocator<> a;
   a.Init(/* may_return_null */ false);
   AllocatorStats stats;
   stats.Init();
 
   static const int kNumAllocs = 1000;
   char *allocated[kNumAllocs];
TEST(SanitizerCommon, LargeMmapAllocator) {
   // Regression test for boundary condition in GetBlockBegin().
   uptr page_size = GetPageSizeCached();
   char *p = (char *)a.Allocate(&stats, page_size, 1);
   CHECK_EQ(p, a.GetBlockBegin(p));
   CHECK_EQ(p, (char *)a.GetBlockBegin(p + page_size - 1));
   CHECK_NE(p, (char *)a.GetBlockBegin(p + page_size));
   a.Deallocate(&stats, p);
 }
-#endif
 
 template
 <class PrimaryAllocator, class SecondaryAllocator, class AllocatorCache>
 void TestCombinedAllocator() {
   typedef
       CombinedAllocator<PrimaryAllocator, AllocatorCache, SecondaryAllocator>
       Allocator;
   Allocator *a = new Allocator;

 
 TEST(SanitizerCommon, CombinedAllocator64Compact) {
   TestCombinedAllocator<Allocator64Compact,
       LargeMmapAllocator<>,
       SizeClassAllocatorLocalCache<Allocator64Compact> > ();
 }
 #endif
 
-#if !defined(_WIN32)  // FIXME: This currently fails on Windows.
 TEST(SanitizerCommon, CombinedAllocator32Compact) {
   TestCombinedAllocator<Allocator32Compact,
       LargeMmapAllocator<>,
       SizeClassAllocatorLocalCache<Allocator32Compact> > ();
 }
-#endif
 
 template <class AllocatorCache>
 void TestSizeClassAllocatorLocalCache() {
   AllocatorCache cache;
   typedef typename AllocatorCache::Allocator Allocator;
   Allocator *a = new Allocator();
 
   a->Init();