[compiler-rt] [NFC] [HWASan] clarify FIXME comment (PR #87689)

[Thurston Dang via llvm-commits]

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@@ -55,6 +55,9 @@ static uptr RingBufferSize() {
   uptr desired_bytes = flags()->stack_history_size * sizeof(uptr);
   // FIXME: increase the limit to 8 once this bug is fixed:
   // https://bugs.llvm.org/show_bug.cgi?id=39030
+  // Note that we *cannot* do that on Android, as the runtime will indefinitely
+  // have to support code that is compield with ashr, which only works with
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thurstond wrote:

Nit: "compield"

https://github.com/llvm/llvm-project/pull/87689