linux-user: AArch64: Implement SA_RESTORER for signal handlers
Implement support for signal handlers with the SA_RESTORER flag set. Signed-off-by: NMichael Matz <matz@suse.de> [PMM: minor tweaks to make patch apply to current master] Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NRiku Voipio <riku.voipio@linaro.org> Reviewed-by: NRichard Henderson <rth@twiddle.net>
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