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target-xtensa: switch to AREG0-free mode
Add env parameter to every helper function that needs it, update'configure' script.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
target-xtensa: add attributes to helper functions
Mark exception generating functions 'noreturn' and pure constantfunctions as such.
target-xtensa: Move helpers.h to helper.h
Provides a file naming scheme consistent with other targets.
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>