[lra] patch to remove -flra option

[Vladimir Makarov]

The following patch mostly removes -flra option by defining a 
machine-dependent hook lra_p.  If the hook returns true, LRA is used.  
Otherwise, reload pass is used.  By default the hook returns false.  It 
returns true for 8 targets, lra was ported (i386, rs6000, arm, s390, 
ia64, sparc, mips, pa).

The patch was successfully bootstrapped on x86/x86-64.

Committed as rev. 190564.

2012-08-21  Vladimir Makarov  <vmakarov@redhat.com>

         * targhooks.h (default_lra_p): Declare.
         * targhooks.c (default_lra_p): New function.
         * target.def (lra_p): New hook.
         * ira.h (ira_use_lra_p): New external.
         * ira.c (ira_init_once, ira_init, ira_finish_once): Call
         lra_start_once, lra_init, lra_finish_once in anyway.
         (ira_setup_eliminable_regset, setup_reg_renumber): Use 
ira_use_lra_p instead of
         flra_lra.
         (ira_use_lra_p): Define.
         (ira): Set up ira_use_lra_p.  Use ira_use_lra_p instead of
         flra_lra.
         * dwarf2out.c: Add ira.h.
         (based_loc_descr, compute_frame_pointer_to_fb_displacement): Use
         ira_use_lra_p instead of ira_use_lra_p.
         * rtlanal.c (simplify_subreg_regno): Add comments.
         * Makefile.in (dwarf2out.c): Add dependence ira.h.
         * doc/passes.texi: Change LRA pass description.
         * doc/tm.texi.in: Add TARGET_LRA_P.
         * doc/tm.texi: Update.
         * doc/invoke.texi: Remove -flra option.
         * common.opt: Remove flra option.  Add description for
         flra-reg-spill.
         * reginfo.c (allocate_reg_info): Fix a comment typo.
         * config/arm/arm.c (TARGET_LRA_P): Define.
         (arm_lra_p): New function.
         * config/sparc/sparc.c (TARGET_LRA_P): Define.
         (sparc_lra_p): New function.
         * config/s390/s390.c (TARGET_LRA_P): Define.
         (s390_lra_p): New function.
         * config/i386/i386.c (TARGET_LRA_P): Define.
         (ix86_lra_p): New function.
         * config/rs6000/rs6000.c (TARGET_LRA_P): Define.
         (rs6000_lra_p): New function.
         * config/mips/mips.c (TARGET_LRA_P): Define.
         (mips_lra_p): New function.
         * config/pa/pa.c (TARGET_LRA_P): Define.
         (pa_lra_p): New function.
         * config/ia64/ia64.c (TARGET_LRA_P): Define.
         (ia64_lra_p): New function.

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