bfin.opt (mstack-check-l1): New.
* config/bfin/bfin.opt (mstack-check-l1): New. * doc/invoke.texi (Blackfin Options): Document it. * config/bfin/bfin.c (bfin_expand_prologue): Generate code to use stack bounds in L1 memory if the new option is enabled. (override_options): Don't allow combinations of -fstack-limit and -mstack-check-l1. (add_to_reg): Renamed from add_to_sp. All callers changed. Lose some dead code. From-SVN: r119049
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