[PATCH/ARM] PR 16722, support VLDR s/d0, =Imm

[Jiong Wang]

LDR support load constants from literal pool or optimize to vmov, while no such support on VLDR. This patch fixes this issue.

the logic of this patch is

for VLDR s/d, =IMM, (currently no support for FPIMM)

if (s reg)
   always spill to literal pool.

if (d reg)
   if (IMM acceptable by vmov)
     {
       if (thumb_mode)
         rewrite vldr d, #IMM to vmov.XX d, #IMM under thumb2 encoding.
       else
         rewrite under arm encoding.
     }
   else
     spill to literal pool.

OK for trunk?

thanks.

PR target/16722
gas/
   * config/tc-arm.c (add_to_lit_pool): Add one parameter 'nbytes'.
   Support literal pool entry be 8 byte.
   (s_ltorg): Likewise.
   (enum lit_type): New enum type.
   (encode_arm_cp_address): Generate literal pool entry if possible.
   (move_or_literal_pool): Generate entry for vldr case.
   (do_ldst): Use new enum type.
   (do_ldstv4): Likewise.
   (do_t_ldst): Likewise.
   (neon_write_immbits): Support Thumb-2 mode.
  
gas/testsuite/
   * gas/arm/ldconst.s: Add new cases for vldr.
   * gas/arm/ldconst.d: Likewise.
   * gas/arm/thumb2_pool.s: Likewise.
   * gas/arm/thumb2_pool.d: Likewise.

-- 
Jiong
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