Add support for TLS in MicroBlaze

Add support for TLS in MicroBlaze

 * configure.ac: Add MicroBlaze TLS support detection.
 * configure: Regenerate.
 * config/microblaze/microblaze-protos.h: (microblaze_cannot_force_const_mem,
   microblaze_tls_referenced_p, symbol_mentioned_p,
   label_mentioned_p): Add prototypes.
 * config/microblaze/microblaze.c (microblaze_address_type): Add ADDRESS_TLS
   and tls_reloc address types.
   (microblaze_address_info): Add tls_reloc.
   (TARGET_HAVE_TLS): Define.
   (get_tls_get_addr, microblaze_tls_symbol_p, microblaze_tls_operand_p_1,
    microblaze_tls_referenced_p, microblaze_cannot_force_const_mem,
    symbol_mentioned_p, label_mentioned_p, tls_mentioned_p, load_tls_operand,
    microblaze_call_tls_get_addr, microblaze_legitimize_tls_address): New functions.
   (microblaze_classify_unspec): Handle UNSPEC_TLS.
   (get_base_reg): Use microblaze_tls_symbol_p.
   (microblaze_classify_address): Handle TLS.
   (microblaze_legitimate_pic_operand): Use symbol_mentioned_p, label_mentioned_p
    and microblaze_tls_referenced_p.
   (microblaze_legitimize_address): Handle TLS.
   (microblaze_address_insns): Handle ADDRESS_TLS.
   (pic_address_needs_scratch): Handle TLS.
   (print_operand_address): Handle TLS.
   (microblaze_expand_prologue): Check TLS_NEEDS_GOT.
   (microblaze_expand_move): Handle TLS.
   (microblaze_legitimate_constant_p): Check microblaze_cannot_force_const_mem
    and microblaze_tls_symbol_p.
   (TARGET_CANNOT_FORCE_CONST_MEM): Define.
 * config/microblaze/microblaze.h (TLS_NEEDS_GOT): Define
   (PIC_OFFSET_TABLE_REGNUM): Set.
 * config/microblaze/linux.h (TLS_NEEDS_GOT): Define.
 * config/microblaze/microblaze.md (UNSPEC_TLS): Define.
   (addsi3, movsi_internal2, movdf_internal): Update constraints
 * config/microblaze/predicates.md (arith_plus_operand): Define
   (move_operand): Redefine as move_src_operand, check microblaze_tls_referenced_p.

Co-Authored-By: David Holsgrove <david.holsgrove@xilinx.com>
From-SVN: r196659