[compiler-rt] [compiler-rt][sanitizer] fix i386 build for Haiku (PR #171075)

[David CARLIER via llvm-commits]

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@@ -1987,7 +1987,7 @@ SignalContext::WriteFlag SignalContext::GetWriteFlag() const {
 #    elif SANITIZER_NETBSD
   uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR];
 #    elif SANITIZER_HAIKU
-  uptr err = ucontext->uc_mcontext.r13;
+  uptr err = 0;  // ucontext->uc_mcontext.r13;
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devnexen wrote:

oh phewww :) might make sense to make a FIXME/TODO comment here then.

https://github.com/llvm/llvm-project/pull/171075