[compiler-rt] [asan] Switch allocator to dynamic base address (PR #98511)

[Vitaly Buka via llvm-commits]

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@@ -214,7 +214,7 @@ const uptr kAllocatorSpace = 0x600000000000ULL;
 const uptr kAllocatorSize  =  0x40000000000ULL;  // 4T.
 typedef DefaultSizeClassMap SizeClassMap;
 #  else
-const uptr kAllocatorSpace = 0x500000000000ULL;
+const uptr kAllocatorSpace = ~(uptr)0;
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vitalybuka wrote:

looks like all but Apple, 

maybe include Apple, with apple reviewers, and move out constant from #ifdefs ?

https://github.com/llvm/llvm-project/pull/98511