[compiler-rt] [scudo] Move ALWAYS_INLINE up in tsd_shared's ScopedTSD ctor (PR #81982)

[Fabio D'Urso via llvm-commits]

fabio-d wrote:

(for future reference, the issue was https://g-issues.fuchsia.dev/issues/323911094)

https://github.com/llvm/llvm-project/pull/81982