[scudo] Set name for reserved regions in SizeClassAllocator64

[Chia-hungDuan]

Summary

This improves the readability of address space

[enh]

thanks!

compiler-rt/lib/scudo/standalone/primary64.h

public:
   }
 
   static bool canAllocate(uptr Size) { return Size <= SizeClassMap::MaxSize; }
 
   void init(s32 ReleaseToOsInterval) NO_THREAD_SAFETY_ANALYSIS {
     DCHECK(isAligned(reinterpret_cast<uptr>(this), alignof(ThisT)));
     DCHECK_EQ(PrimaryBase, 0U);
     // Reserve the space required for the Primary.
-    PrimaryBase = reinterpret_cast<uptr>(
-        map(nullptr, PrimarySize, nullptr, MAP_NOACCESS, &Data));
+    PrimaryBase = reinterpret_cast<uptr>(map(
+        nullptr, PrimarySize, "scudo:primary_reserve", MAP_NOACCESS, &Data));
 
     u32 Seed;
     const u64 Time = getMonotonicTime();
     if (!getRandom(reinterpret_cast<void *>(&Seed), sizeof(Seed)))
       Seed = static_cast<u32>(Time ^ (PrimaryBase >> 12));
     const uptr PageSize = getPageSizeCached();
     for (uptr I = 0; I < NumClasses; I++) {
       RegionInfo *Region = getRegionInfo(I);