* config/tc-alpha.c (s_alpha_usepv): New.

        (md_pseudo_table): Add it.
        (alpha_cfi_frame_initial_instructions): New.
        * config/tc-alpha.h (TARGET_USE_CFIPOP): New.
        (tc_cfi_frame_initial_instructions): New.
        * doc/c-alpha.texi: Document .usepv.

        * gas/alpha/elf-usepv-1.[sd]: New.
        * gas/alpha/elf-usepv-2.[sd]: New.
        * gas/alpha/alpha.exp: Run them.
        * gas/cfi/cfi-alpha-3.[sd]: New.
        * gas/cfi/cfi.exp: Run it.