tcg: don't explicitly save globals and temps
The liveness analysis ensures that globals and temps are at the correct state at a basic block end or with an op with side effects. Avoid looping on all temps, this can be time consuming on targets with a lot of globals. Keep an assert in debug mode. Reviewed-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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