[compiler-rt] [asan] Change Apple back to fixed allocator base address (PR #104818)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: Thurston Dang (thurstond)

<details>
<summary>Changes</summary>

This partially reverts https://github.com/llvm/llvm-project/pull/98511
- specifically, the SANITIZER_APPLE case - because of a suspected breakage for clang on Mac (https://g-issues.chromium.org/issues/360160858).

---
Full diff: https://github.com/llvm/llvm-project/pull/104818.diff


1 Files Affected:

- (modified) compiler-rt/lib/asan/asan_allocator.h (+6) 


``````````diff
diff --git a/compiler-rt/lib/asan/asan_allocator.h b/compiler-rt/lib/asan/asan_allocator.h
index b52cdeb7308923..db8dc3bebfc620 100644
--- a/compiler-rt/lib/asan/asan_allocator.h
+++ b/compiler-rt/lib/asan/asan_allocator.h
@@ -189,7 +189,13 @@ const uptr kAllocatorSize = 0x40000000000ULL;  // 4T.
 typedef DefaultSizeClassMap SizeClassMap;
 #    endif  // SANITIZER_RISCV64
 #  else     // SANITIZER_FUCHSIA
+
+#    if SANITIZER_APPLE
+const uptr kAllocatorSpace = 0x600000000000ULL;
+#    else   // SANITIZER_APPLE
 const uptr kAllocatorSpace = ~(uptr)0;
+#    endif  // SANITIZER_APPLE
+
 #    if defined(__powerpc64__)
 const uptr kAllocatorSize  =  0x20000000000ULL;  // 2T.
 typedef DefaultSizeClassMap SizeClassMap;

``````````

</details>


https://github.com/llvm/llvm-project/pull/104818