[compiler-rt] [asan][sanitizer_common][AIX] Set allocator size and beginning (PR #144784)

[Jake Egan via llvm-commits]

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@@ -23,7 +23,12 @@ namespace __sanitizer {
 typedef CompactSizeClassMap InternalSizeClassMap;
 
 struct AP32 {
+// For AIX 64-bit, the mmap begin is at address 0x0a00000000000000ULL.
+#if SANITIZER_AIX && SANITIZER_WORDSIZE == 64
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jakeegan wrote:

Opened #147645 for this.

https://github.com/llvm/llvm-project/pull/144784