unwind-dw2.c (_Unwind_GetGR): Honor DWARF_ZERO_REG.
* unwind-dw2.c (_Unwind_GetGR): Honor DWARF_ZERO_REG. * doc/tm.texi (DWARF_ZERO_REG): New. * config/alpha/alpha.c (alpha_sa_mask, alpha_expand_prologue, alpha_expand_epilogue): Revert 2003-09-30 change to store zero. * config/alpha/alpha.h (DWARF_ZERO_REG): New. From-SVN: r88331
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