* alpha.c (alpha_expand_prologue, alpha_expand_epilogue): New fns.
        (output_prologue, output_epilogue): Merge VMS and OSF versions;
        Remove anything related to the actual code generation.
        (output_end_prologue): New function.
        (alpha_sa_mask, alpha_sa_size): Merge VMS and OSF versions.
        (alpha_does_function_need_gp): Return false for VMS.
        (alpha_function_needs_gp): Make static.
        (add_long_const): Delete.
        (summarize_insn): Don't assume a SUBREG is of a REG.
        Prototype all static functions.  Rename VMS-specific global
        variables vms_*.
        * alpha.h (TARGET_CAN_FAULT_IN_PROLOGUE): Default to 0.
        (FUNCTION_BOUNDARY): Align to cache line.
        (LOOP_ALIGN, ALIGN_LABEL_AFTER_BARRIER): Align to octaword.
        (FUNCTION_END_PROLOGUE): New macro.
        * alpha.md (attribute length): New.  Mark all insns.
        (return_internal, prologue_stack_probe_loop) New patterns.
        (prologue, init_fp, epilogue): New patterns.
        Disable peepholes.
        * linux.h (TARGET_CAN_FAULT_IN_PROLOGUE): Define.

From-SVN: r20528