[scudo] Remove comment about security of the 32-bit allocator

[cryptoad]

Summary

The 32-bit allocator is now on par with the 64-bit in terms of security (chunks
randomization is done, batches separation is done).

Unless objection, the comment can go away.

lib/scudo/scudo_allocator.h

struct AP64 {
   static const uptr kMetadataSize = 0;
   typedef __scudo::SizeClassMap SizeClassMap;
   typedef NoOpMapUnmapCallback MapUnmapCallback;
   static const uptr kFlags =
       SizeClassAllocator64FlagMasks::kRandomShuffleChunks;
 };
 typedef SizeClassAllocator64<AP64> PrimaryAllocator;
 #else
-// Currently, the 32-bit Sanitizer allocator has not yet benefited from all the
-// security improvements brought to the 64-bit one. This makes the 32-bit
-// version of Scudo slightly less toughened.
 static const uptr NumRegions = SANITIZER_MMAP_RANGE_SIZE >> RegionSizeLog;
 # if SANITIZER_WORDSIZE == 32
 typedef FlatByteMap<NumRegions> ByteMap;
 # elif SANITIZER_WORDSIZE == 64
 typedef TwoLevelByteMap<(NumRegions >> 12), 1 << 12> ByteMap;
 # endif  // SANITIZER_WORDSIZE
 struct AP32 {
   static const uptr kSpaceBeg = 0;