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Re: [Patch, updated] Make emulated TLS lto-friendly.

Test #5, delta from #4.

Moving the generation of the constructor function from the end of
compilation into the IPA pass, while simplifying things generally,
revealed to latent bugs:

(1) The cdtor generator function failed to zero out all the state.
(2) Cgraph failed to run all of the required passes on the new function.


r~

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